What Cookie & Kitty Did After Mom’s Brutal Murder Shocked Investigators
What Cookie & Kitty Did After Mom’s Brutal Murder Shocked Investigators
As Told by Sergeant Robert Brown — Lead Investigator on the Del Rio Case
My name is Sergeant Robert Brown.
I’ve been with law enforcement long enough to know that every homicide scene carries a pattern.
Shock.
Confusion.
Grief.
Denial.
But every once in a while, a case breaks that pattern so completely that it forces even experienced detectives like me to rethink what we thought we understood about human behavior.
The case of Caroline Peña in Del Rio, Texas is one of those cases.
And what happened after her death—specifically what her accused attackers did in the minutes and hours that followed—is something I have never been able to forget.
Even now, years later, it still doesn’t feel like a closed chapter.
1. The Case Begins With a Mother Who Never Saw It Coming
When I first arrived in Del Rio that afternoon, I wasn’t thinking about media headlines or public reaction.
I was looking at a crime scene on East 10th Street where a mother of five had been violently attacked in broad daylight.
Her name was Caroline Peña, though everyone called her Carol.
She wasn’t someone who made the news.
She was someone who made life work.
Five children.
Two with special needs.
A routine built around survival, not luxury.
From everything I saw and everything witnesses later told us, Carol was a woman who lived for her kids in a way that left very little room for herself.
Nothing in her background suggested she would end up at the center of a homicide investigation.
And nothing prepared her family for what came next.
2. The Attack on East 10th Street
The attack happened just after 2:00 PM near a busy intersection by a Sonic Drive-In.
Witnesses described three young women approaching Carol.
They were later identified as:
Kitty Mia Diaz (21)
Amaya “Cookie” Diaz (19)
Kandra Renee Faz (21)
What happened next unfolded in full daylight.
Cars were passing.
People were nearby.
And yet violence erupted in seconds.
Carol tried to defend herself.
That much every witness agrees on.
She did not go down immediately.
She fought.
She got back up.
She kept fighting even after sustaining serious injuries.
By the time officers arrived, she had already been critically wounded.
She was transported to San Antonio, where she later died that evening.
3. The Moment the Investigation Changed Direction
In most homicide cases, the focus is simple at first.
What happened?
Who was involved?
Why did it happen?
But in this case, something unusual happened almost immediately after the initial response.
As we began reviewing surveillance footage and witness statements, another layer emerged.
Not just the crime itself—but the behavior afterward.
And that is where things became difficult to categorize.
4. What Happened After the Arrests
We moved fast.
Within hours, we had identified suspects.
Within hours after that, we were at a residence tied to the Diaz sisters.
Multiple units responded.
The arrests were made without incident.
But what we captured next is what later shocked the public—and frankly, unsettled some of my own team.
The Behavior No One Expected
When Kitty Diaz was escorted out of the house, she did not behave the way most homicide suspects behave.
There was no visible panic.
No emotional breakdown.
No visible shock.
Instead, she smiled.
Directly toward the cameras.
Almost knowingly.
As if she understood she was being recorded.
As if the situation was something she could perform rather than experience.
Her younger sister Cookie followed moments later.
Her behavior was even more striking.
Witnesses described her as laughing during the walk to the patrol car.
At one point, she turned toward a person filming the arrest and shouted something sarcastic before being placed inside the vehicle.
Then she smiled for her booking photo.
Kitty did the same.
No visible distress.
No visible remorse.
Just calm engagement with the cameras.
5. Why That Footage Matters to Investigators
Let me be very clear about something most people misunderstand.
Behavior after an arrest is not proof of guilt.
It is not evidence of intent.
It does not replace forensic findings or witness testimony.
But in investigative work, it does something else:
It informs psychological context.
And in this case, the contrast between the brutality of the crime and the emotional tone afterward created a profile we could not ignore.
6. The Evidence We Are Still Reviewing
At the time of writing this, the investigation is still active in several areas.
We are continuing to analyze:
Surveillance footage from East 10th Street
Cell phone data from all three suspects
Witness interviews from multiple locations
Digital communication records before and after the attack
Social media activity surrounding the incident
Each piece adds structure to the timeline.
But none of it, by itself, fully explains motivation.
That remains the central unanswered question.
7. The Victim’s Final Hours
Carol’s last hours were ordinary.
That is what makes this case harder than most.
She spent the morning with her children.
She handled responsibilities like she always did.
She wasn’t running from anything.
She wasn’t expecting anything.
There were no known threats documented.
No known escalation.
No clear warning signs.
And then, in the middle of the afternoon, everything changed.
8. What Witnesses Saw on East 10th Street
We interviewed multiple eyewitnesses.
Their accounts are consistent on key points:
The confrontation happened quickly
Carol attempted to defend herself
She did not immediately collapse
She was struck multiple times
Bystanders called emergency services immediately
One witness described the scene to me personally:
“It didn’t feel real. It felt like something you watch from far away—but it was right in front of us.”
Those moments are what define the case technically.
But they are not what define it emotionally.
9. The Digital Trail That Reconstructed the Timeline
Technology played a major role in this investigation.
Cell phone tracking allowed us to reconstruct movements before and after the incident.
Surveillance footage from nearby businesses helped confirm positioning.
We were able to align timestamps from:
Gas stations
Convenience stores
Traffic cameras
Restaurant security systems
That allowed us to build a near minute-by-minute sequence.
It was that reconstruction that ultimately led to probable cause for arrest.
10. Why the Arrest Behavior Still Haunts the Case
I’ve worked homicide cases for most of my career.
I’ve seen suspects cry.
I’ve seen suspects go silent.
I’ve seen suspects break down completely.
But I have rarely seen behavior like what we observed in Del Rio that day.
And I don’t say that lightly.
Because while emotion does not determine guilt…
it does raise questions about perception, awareness, and detachment.
Those are questions juries often end up having to consider indirectly.
11. What We Have Not Released Yet
There are details in this case that have not yet been made public.
Some relate to:
Early digital communications analysis
Behavioral timeline discrepancies before the confrontation
Additional surveillance angles not yet released
Interview transcripts that remain sealed pending trial
These details will eventually become part of the public record.
But I can say this:
They add complexity.
Not clarity.
And investigators are still working through what that means.
12. The Case Moving Forward
At this stage, Kitty Diaz, Cookie Diaz, and Kandra Faz remain in custody.
They have been formally charged with murder.
The legal process ahead will determine individual responsibility, motive interpretation, and final accountability.
But from an investigative standpoint, our job is not to interpret emotion.
Our job is to establish fact.
And the facts in this case are still being assembled.
Final Words From My Perspective
I’ve been asked many times what stands out most to me in this case.
People expect me to say the violence.
Or the speed of the attack.
Or the age of the suspects.
But that’s not it.
What stays with me is the disconnect.
Between what happened on that street…
and what we saw afterward on camera.
That disconnect is what makes this case difficult to forget.
And it is also why, even now, I believe there are still aspects of this story the public has not fully seen yet.
More details will come out in court.
And when they do, I suspect this case will be understood very differently than it is today.
