They Looked Like Normal Teens… Then They Killed Their Parents

Watch her face closely. 14 girls ages 14 to 18 [music] four courtrooms and in every single one cameras caught a reaction nobody expected. 18-year-old Isabella Guzman smiled [music] and made faces at the camera during her hearing. 14-year-old Karlie Gregg broke down as the jury read its decision. 16-year-old Julia Grace Egler sat [music] quietly on an interrogation tape saying the words, “I should have told her I loved her.

” And 17-year-old Sarah Grace Patrick sat calm, almost cheerful, as a judge decided whether she’d walk free. Four girls who on paper had nothing in common except for what happened next. Let’s break down all four cases in this true crime documentary starting with the one that became famous for all the wrong reasons. The Isabella Guzman case.

 So, I am not this Isabella girl. All this crazy   keeps happening and I am not this girl.  Crazy   That’s a good way to put it.  How would you feel if this was done to you?  I’d scared if I were you.  Aurora, Colorado, August 2013. On the outside this looked like any other quiet suburban neighborhood.

Inside one of these homes lived 18-year-old Isabella Guzman and her mother Yun-Mi Hoy. Two days before the killing Isabella and her mother got into a heated argument. According to police, Isabella spit in her mother’s face.  The fight with my mom was terrible and um I was injured in the process. I have the scars on my hands.

 Um I don’t know if you can see it or not.  The next morning, the same day her mother would die Yun-Mi Mi email from her own Three words. You will pay. Frightened, [music] Yun Mi Hoy called the police that same day. Officers came to the home, spoke with the family, and left, believing the situation had been resolved. That night, her stepfather heard a strange sound coming from upstairs.

When he went to check, he found Isabella standing in the bathroom doorway. Yun Mi Hoy was pronounced dead at the scene. Her own daughter would later be charged with her mother’s murder.  I cannot imagine how terrifying it would be to be murdered by the being that you created, that you birthed. It makes me emotional even thinking about it.

 By the time officers arrived, Isabella was already gone. Police launched a manhunt overnight, calling her armed and dangerous.  I think the one is looking for Isabella Guzman. Looks like cut her mother’s throat.  She’s on foot somewhere in the area.  She was found the next afternoon walking out of a nearby parking garage.

Here’s where this stops being a simple crime report and starts becoming something psychologists are still studying to this day.  I was not myself when I did that.  And I just want to say the sheer brutality and viciousness of the attack from her own daughter, her own flesh and blood, is difficult to fathom.

 You left her to die brutally on a bathroom  not murder anyone. Please stop accusing me of this.  tell me how that feels.  Please fingerprint me. Please fingerprint me. Please fingerprint me. I will show you that I am not [music] this freaky horrible person.  So, she’s 110 lb. That’s really skinny.  I’m 148 lb.

 Isabella, please.  The truth is that she is Isabella, and she did just murder her mother. But, at this point, investigators have no idea that she’s schizophrenic, and they just continue to berate her.  I’ve watched Forensic Files.  Do you believe everything they put on TV is real?  I don’t  How stupid are you? Really, Isabella? Does that make any goddamn sense to you?  Stop calling me Isabella.

 That’s your name.  No, it’s not.  You’ve come in here trying to  act like you’re so goddamn smart.  Well, you’re one of the most evil person I’ve ever sat [music] across the table from.  No.  You’re not getting out of jail. It makes me physically sick to look at  Do a DNA test that will prove you are wrong.

 Don’t tell me how to do my job.  Who’s that?  That’s my baby.  Okay. Sir, you recognize Do you recognize this?  She can be removed.  Do you have any questions? Come back out here, please. Do you recognize her?  Yes, she’s my daughter.  What’s her What’s her name?  Isabella.  Isabella? What’s her last name?  Guzman.

 Isabella Guzman.  Okay.  All right, this photograph here.  What?  Who’s that photograph?  That’s her.  Is that your daughter there?  Yeah. I still can’t believe it. I thought that I made progress, but obviously I didn’t do nothing because hours later then this thing happened.  A doctor who evaluated Guzman testified in court that she was schizophrenic and had been suffering from disturbing delusions for years before that day.

According to court records, Guzman didn’t believe she was harming her own mother at all. Because of her illness, she believed she was stopping a completely different person, someone she called Cecilia, in order to protect the world from some greater threat. Which raises the question that true crime communities still argue about today.

If someone’s mind genuinely can’t tell the difference between their own mother and a stranger, how do you even assign blame? That question comes to a head at Isabella Guzman’s very first court appearance. The cameras are already rolling when this 18-year-old is escorted into the courtroom. She looks toward the lens and smiles.

Then comes the smirk. The pointing at her own eyes. A reaction nobody in that room expects. And one nobody watching at home can look away from. It’s the kind of moment that splits a room in half. Some see a young woman who’s completely lost touch with reality. Others see something closer to mockery. Like she knows exactly what she’s doing.

Even the people who’ve studied this true crime case for years still don’t fully agree on which one it is. Years later, those same 8 seconds of footage resurfaced on TikTok. Some clips set to music. Others imitated by creators trying to recreate her exact expression. One compilation alone reached nearly 2 million views.

People who’d never read a single page of the court file had already made up their minds about her off of 8 seconds of video. So what actually happened in that courtroom, [music] legally speaking? The court ultimately found Guzman not guilty by reason of insanity. Instead of prison, she was sent to the state mental hospital where she’d remain until doctors determine she was no longer a threat.

 I was abused at home by my family for many years. My parents are Jehovah’s Witnesses. And um I left the religion when I was 14. And the abuse at home worsened after I quit.  No trial by jury. No dramatic verdict moment.  [music]  Just a jide, a stack of psychiatric evaluations, and a ruling that satisfied almost no one completely.

 I’m not mentally ill anymore. I’m not a danger to myself or others.  Can someone be rehabilitated from something like that?  The prosecution didn’t fight it. The public didn’t fully accept it. And the Isabella Guzman case became one of the first true crime cases to prove something unsettling. That a courtroom camera can turn a person into internet content before anyone understands what actually happened inside her mind.

 This whole TikTok viral thing with the song Sweet [music] but Psycho playing in the background is just even more disgusting.  The generation that we’re living in and the generation [music] of younger kids, guys, it’s truly scary. It’s truly truly scary.  So when you glamourise murderers and then you lift them up because of their appearance and then you [music] mix it in with a TikTok trend, it’s just weird.

 Now, compare that to what happened 11 years later in a different state with a girl who was only 14 and a very different reaction inside the courtroom. This is the case of Carly Gregg. [music]  You the jury have found the defendant guilty of the crime of first-degree murder in count one.

 You must now decide whether to impose either a life a sentence [music] of life imprisonment in the custody of the Department of Corrections or life imprisonment in the custody of the Department of Corrections with the possibility of parole.  Brandon, Mississippi. A Tuesday afternoon in March. Nothing special about it. 14-year-old Carly Gregg lived here with her mother, Ashley, a math teacher,  [music]  and her stepfather, Heath.

Nobody driving past this house would have looked twice. A few days earlier, one of Carly’s classmates had picked up on something.  [music]  The drugs, a couple of burner phones her mother didn’t know about. He decided to say something.  [music]  So he calls Ashley. He has no idea what that one phone call is about to trigger.

That day, Ashley comes home and goes straight to Carly’s room  [music]  searching for exactly what her friend described. Carly just stands there. She isn’t just standing there, though. There’s a gun behind her back. The kitchen camera is running the whole time. It catches Karli walking, [music] almost casually, toward her mother’s bedroom.

Three gunshots. Then, nothing. Ashley Smiley doesn’t survive it. What Karli does in the minutes after is the part people can’t quite get past. No screaming, [music] no running out of the house. She grabs her mother’s phone and texts her stepfather, asking when he’ll be home. He walks in with no idea what he’s walking into.

 [music]  Heath is shot, too, but he manages to wrestle the gun away and calls 911 himself.  Oh my god. Brooke. Oh my god. Brooke, help me. Help me, Brooke. I don’t know what happened. My wife is dead. Oh.  What happened?  My daughter tried to shoot me. Oh.  Your daughter tried to shoot you?  Yeah. She shot at me. She’s shooting at me.

 What’s her name?  I don’t know what I’m doing. Karli Gregg.  Six minutes of him barely able to get words out, and one line keeps surfacing through the panic. She killed her mom.  Hello. I saw I need medical here.  And that’s really the whole question the trial came down to. Was this a 14-year-old in total psychological freefall, or someone moving through each step with a plan? Karli’s defense went with the first read, a girl in the grip of a genuine mental health crisis, not fully aware of what she was doing.

Then the prosecution puts a witness on the stand who makes that harder to believe. It’s the friend Carly had called over that same afternoon to see what she’d just done. On the stand, the friend remembers exactly what Carly said to her, standing a few feet from the body. Are you squeamish around dead bodies? Nobody in that courtroom needs it explained further.

Whatever’s happening in Carly’s head, it doesn’t sound like someone who’s lost her grip on reality. It sounds like someone who knows precisely what she’s done. The jury takes 2 hours, [music] guilty on every count. Carly Gregg breaks down in that Rankin County courtroom, sobbing as the verdict lands, her attorneys at her side.

 Life without parole. Her lawyers have already filed an appeal, and it’s sitting with the Mississippi Supreme Court now, waiting on its own decision. The next girl in this story hasn’t even gone to trial yet,  [music]  and she’s already become something Isabella Guzman and Carly Gregg never were. Famous online before a single juror was picked.

This is the case of Sarah Grace Patrick.  She would never do this. As a father, this has been one of the most hopeful things in my life. I’m sorry, but  Carrollton, Georgia. That’s where Kristen Brock lived with her husband James, their 5-year-old daughter, and Kristen’s 17-year-old daughter from a previous relationship, Sarah Grace Patrick.

February 20th, 2025. [music] Somewhere in the middle of the night, James’s LVAD, the mechanical pump keeping his heart going after years of heart failure, starts alarming. Sarah is home. She doesn’t go check on it. She doesn’t call anyone. The next morning, the couple’s 5-year-old daughter is the one who finds them.

She runs to her older sister. Sarah is the one who calls 911. When deputies arrive, the scene tells them almost nothing. No forced entry except one door left slightly ajar for reasons nobody has explained. Nothing missing from the house. Kristen and James Brock died from gunshot wounds as they slept. The exact number of shots would later become part of the case record.

No weapon at the scene. For months, that’s the entire file. What isn’t quiet is Sarah’s phone. She’s posting through it. Tearful videos, prayer requests, captions asking people to keep her family in their hearts. She also starts messaging true crime creators directly.  [music]  I had not heard of this case until Sarah Grace messaged me on June 3rd asking me to cover the Brock case.

 [music] She went on to explain it was the unsolved case of her parents murder, her mother Kristen and stepfather James, and it needed a light shined on it.  At the funeral, she gets up and speaks.  My name is Sarah and I’m Kristen Brock’s daughter  [music]  and James Brock’s stepdaughter. This isn’t easy thing to talk about with my family and James because I stutter all the time, you guys,  [music]  although I’ve gotten a lot better at this, but just bear with me because I stutter a lot.

I just wanted to say goodbye to my mom and James since we never got the chance to. I was so used to you guys always being here to complain that I never once thought to imagine you are not being here. I didn’t have a single clue how know I needed to talk to her.  To some people in that church, it’s a grieving teenager saying goodbye to her mother.

 That eulogy was not scripted. My daughter came with that eulogy through her heart for her mom because and James because she thought she was doing the right thing speaking and for people to hold that against her, I mean, come on.  To a niece of the Brocks sitting in the pews, it read differently.  What is this voice that she’s doing that it sounds like crying? Sure, if you heard of an audio of it, sure, she’s crying.

 But, being front row at that funeral, she never shed a tear. She She didn’t stop. She didn’t think about what she was saying. It was a scripted speech. I wouldn’t call it a eulogy like people are calling it. It was a speech where she did shout outs at the end of it.  Five months passed with no arrest, no name in the press. Then, in July, a warrant.

Sarah turns herself in with her father beside her. The same father who will keep telling reporters for the rest of this story that his daughter is innocent. Because she was 16 when the killings happened, Georgia law still allows her to be prosecuted as an adult. The state automatically sends murder charges against anyone 13 or older to adult court.

That’s the system she’s now inside. The family cannot agree on her. Her father and grandfather call her a normal kid caught in something horrific. Other relatives of the Brocks say they’ve had suspicions since that night and question how she could have slept through what happened a room away. Her pastor tells a judge she was baptized while in custody and calls him regularly to pray.

Because of her age, she’s been held in solitary confinement for the length of her detention. A detail her defense has raised in every bond hearing since. Twice, a judge has said no to bond. Twice, she’s gone back to her cell. Investigators still haven’t named a motive on the record. Prosecutors continue to describe the case against her as built on mountains of physical and digital evidence.

Most of which the public still hasn’t seen. And the case just got messier. So, unlike the first two cases in this series, we genuinely don’t know how this one ends. Right now, we’re not even sure when it starts. Next, a case where nobody disputes what happened inside that house. What’s still being fought over is whether the public should have ever gotten to watch a 16-year-old explain it.

 You okay?  I don’t know.  This is Julia Grace Egler, known in court more recently as Jasper. Just after midnight, July 7th, 2024, officers reach a Banker Road Northwest home in Palm Bay, Florida. Answering a 911 call about a break-in.  Oh god. So So Please, I was home alone. And there’s this guy in here.

He broke into the house.  Oh man, I know this is really scary. Um but your mom and her boyfriend should be on their way home.  No, they  Kelly McCollum, 38, and her boyfriend, Matthew Saint Rock, 22, both dead inside.  Okay. All right, I got this one right here. Got a body.  All right.  Yep, got  Call back please.

 Got body on the bathroom floor.  The only one there, Kelly’s 16-year-old, the one who called it in. Charged in court as Julia, already telling detectives she goes by another name, Jasper. Her story holds together at first, hiding in the bedroom with the dogs, loud noises down the hall, too scared to look. Under repeated questioning though, details shift.

 Which door, how long, [music] what she heard first. Per the probable cause affidavit, none of it matches the scene. A detective tells her straight, “Time to say what happened.” Her answer is the moment the story collapses. She pushes back, asking if there’s a point in answering. There was no intruder. There never was. What investigators lay out instead, a handgun taken from Kelly’s room earlier that day.

Julia waiting for them to come home, a confrontation at the door, a gun outside the bedroom, a knife in the kitchen. The motive, per the record, months of tension over being misgendered, her transition, and her mother dating a man a few years older than Julia herself. At one point, she told detectives she used to remind her mother this wasn’t a phase.

None of it explains what she did. It’s simply what’s on record.  Julia.  I apologize, Jasper.  Jasper, right. Did you shoot your your mom and Matthew today?  Are you basically saying that I did, so do you even need my answer?  Because she was 16, [music] this started in juvenile court, but prosecutors moved to try her as an adult on two counts of first-degree premeditated murder.

A grand jury agreed in January 2025. Too young for the death penalty, not they argue, too young for life in prison. In February 2026, body cam footage from that driveway went public. Julia’s attorney called it inappropriate. Broadcasting a child’s private life, he told the judge. The defense also claims detectives implied she’d face lighter consequences in juvenile court.

 Part of why they say she kept talking. The defense asked the judge to dismiss the case or send it to juvenile court. In May 2026, she ruled, Julia stays in adult court. Whether the leaked video voids the case entirely is still undecided. Four women, four different lives. None of them looked like a killer beforehand. That’s what ties these cases together, not the violence itself.

Julia’s is the extreme version of it. Months after everyone agrees on what she did, courts are still arguing over whether to call her a child or an adult. If cases like these are the ones you keep coming back for, subscribe. The next one’s already in the works.