The two Texas sisters accused of fatally stabbing a mother of five in broad daylight allegedly tried to erase evidence of the violent attack before police arrived at their home, according to newly released court documents detailing the investigation.

Investigators say sisters Amaya “Cookie” Diaz, 19, and Kitty Mia Diaz, 21, were captured on surveillance cameras during the deadly confrontation that claimed the life of 32-year-old Caroline “Caro” Peña in Del Rio, Texas, on Thursday afternoon.

Now, prosecutors allege the siblings took immediate steps to conceal their involvement by changing clothes, showering and attempting to wash away potentially critical evidence just hours after the attack.

The allegations are outlined in a criminal complaint filed after the sisters’ arrests, providing new insight into what investigators say happened between the fatal stabbing and the moment officers arrived at their residence.

According to police, surveillance footage showed Peña arriving outside a home where 21-year-old Kyandra Renee Faz lived shortly before the violence erupted.

Authorities have not publicly explained why Peña went to the residence, although investigators have confirmed the victim and the three women knew one another before the deadly encounter.

Police Chief Frank Ramirez has emphasized that the attack does not appear to have been random, though detectives have not yet disclosed a motive or the nature of the relationship between Peña and the three defendants.

Court documents state that Faz later told investigators Peña had arrived at her residence “looking to start a fight.”

Investigators say the surveillance footage paints a dramatic picture of what unfolded moments later.

According to the complaint, a black Chrysler 300 carrying the Diaz sisters pulled up near the residence.

Police allege Amaya Diaz immediately exited the passenger side of the vehicle holding what detectives believe was a knife.

Investigators say video footage shows the teenager approaching Peña before striking her in the back.

The complaint states that blood quickly became visible on Peña’s pink shirt after the alleged stabbing.

Authorities allege Kitty Diaz and Faz then joined the confrontation, physically attacking Peña before all three women fled the scene.

Despite suffering catastrophic injuries, Peña remained alive long enough to be transported from the scene.

Family members reportedly rushed the mother of five to a nearby hospital before she was transferred to a trauma center in San Antonio.

Doctors fought to save her life, but Peña later died from the stab wounds she sustained during the confrontation.

As detectives worked to identify those responsible, investigators soon focused on the Diaz sisters after reviewing surveillance footage from the area.

According to the criminal complaint, officers arrived at the sisters’ residence roughly two hours after the attack.

What they allegedly found immediately caught investigators’ attention.

Police wrote that neither woman was wearing the clothing seen in the surveillance footage.

Instead, officers observed signs suggesting both had recently attempted to clean themselves.

“While speaking with Kitty and Amaya, it was observed that they were no longer wearing the clothing originally seen on the video footage, and they had recently showered, as their hair was wet,” the complaint states.

Investigators believe those actions were not coincidental.

During a search of the residence, detectives allegedly discovered additional evidence suggesting an effort had been made to destroy physical evidence connected to the attack.

According to the complaint, Kitty Diaz’s pink halter-style crop top—the same clothing investigators believe appeared in surveillance footage—was located inside a washing machine.

Officers concluded the garment had recently been washed.

The complaint alleges the clothing had been “recently washed and tampered with,” prompting prosecutors to file an additional tampering with evidence charge against Kitty Diaz alongside the murder allegation.

Authorities have not publicly indicated whether forensic testing recovered blood or other biological evidence from the clothing.

Amaya Diaz and Kyandra Faz currently face murder charges but have not been charged with evidence tampering, according to publicly available court records.

The sisters’ behavior during their arrests has also drawn widespread attention after videos recorded outside their home spread rapidly across social media.

Rather than appearing distressed, both women seemed unusually relaxed while officers escorted them into police vehicles.

The footage showed Kitty Diaz briefly smiling while walking barefoot toward a patrol car.

Her younger sister appeared even more animated.

Video captured Amaya smiling broadly, laughing and calling out, “Stop recording!” toward someone filming the arrests.

The apparent lack of emotion prompted criticism from observers, including Del Rio Police Chief Frank Ramirez.

Speaking publicly about the footage, Ramirez described the sisters’ demeanor as deeply troubling.

“My impression is it didn’t look good, and you would think there would be a little more remorse in a situation like that,” the chief said.

“It looked callous.”

Independent journalist Michael Elizondo, who recorded the arrests, recalled being struck by Amaya’s apparent mood.

“I saw the first girl going into the car, and I thought, ‘Whatever,'” Elizondo said.

“But the second one caught my eye.”

“That girl was in a happy mood,” he continued.

“She was all smiling, goofing off like nothing happened.”

Meanwhile, investigators continue trying to determine what sparked the deadly confrontation.

Although police have confirmed Peña knew all three suspects before the attack, authorities have deliberately withheld additional details while the investigation remains active.

Ramirez has also cautioned against assuming Peña bore responsibility simply because she went to the residence.

Investigators have repeatedly stressed that her presence there should not be interpreted as justification for the violence that followed.

Friends and relatives have instead remembered Peña as a devoted mother whose death devastated her family.

She leaves behind five children, whose lives have been forever altered by the fatal attack.

Loved ones have described her as caring, protective and deeply committed to raising her family.

The shocking killing has also unsettled residents throughout Del Rio, a border community where violent crimes of this nature are relatively uncommon.

The broad-daylight attack unfolded in a residential neighborhood, with surveillance cameras and witnesses documenting portions of the confrontation.

Police have continued collecting digital evidence, interviewing witnesses and reviewing video recordings from multiple locations as prosecutors prepare their case.

At their initial court appearance, Kitty Diaz, Amaya Diaz and Kyandra Faz each requested court-appointed attorneys.

A judge set bond at $5 million for each defendant, citing the seriousness of the allegations.

All three women remain in custody while awaiting further court proceedings.

Investigators have not announced whether additional charges could be filed as forensic testing continues.

Detectives also continue examining the sequence of events leading up to the confrontation, including communications between the victim and the suspects before Thursday’s fatal encounter.

For now, authorities say the investigation remains active, and they continue working to establish precisely what happened during the confrontation that ended with Caroline Peña losing her life.

As prosecutors assemble their case, the newly released court documents have offered the clearest picture yet of investigators’ allegations—not only regarding the deadly stabbing itself, but also what police believe happened afterward as the accused sisters allegedly attempted to wash away the evidence before officers knocked on their door.