16-year-old girl kills former schoolmate after social media feud over ex-boyfriend: Cops

A feud between two Texas teens played out on social media in the days leading up to a fatal stabbing that left one dead and the other in custody at a juvenile detention facility.

According to Fox News, 18-year-old Kaitlin Leonor Castilleja was fatally stabbed early Friday morning during an altercation at the 16-year-old suspect’s San Antonio home.

Castilleja was accompanied by Vivian Foster, also 18, who received superficial wounds in the stabbing.

The 16-year-old girl was not identified in initial reports but police say she had previously attended James Madison High School with the two older teens.

How do you protect your children from predators? Join Nancy Grace and a team of world class experts for the online course ‘Justice Nation: Crime Stops Here’.

Castilleja reportedly graduated in 2018. The suspect was still enrolled as a student at the time of her arrest on suspicion of murder.

Police believe the teens had been engaged in a social media feud and had expressed a desire to fight. Their disagreement reportedly stemmed from a fight over Castilleja’s ex-boyfriend.

The deceased teen’s aunt said the teen “isn’t able to give her side of the story” and pointed to bullying as the catalyst for her homicide.

“It’s social media,” Marie Fernandez said. “There’s so many factors that have contributed to this, and at the end of the day, whether it was wrong, in all aspects my niece had no intentions of hurting anyone.”

In an interview with the San Antonio Express News, she claimed her niece was lured to the spot where she was fatally stabbed.

“They videotaped the attack,” she said. “What kind of person does that?”

Join Nancy Grace for her new video series new online video series designed to help you protect what you love most – your children.

[Featured image: Kaitlin Leonor Castilleja, Facebook]