Ongoing social media feud between teens ended in fatal stabbing, family says Ongoing social media feud between teens ended in fatal stabbing, family says According to a preliminary police report, Castilleja and Vivian Foster, 18, went to the suspect's house at about 1 a.m. Friday. During the fight, the suspect stabbed both of the girls, causing superficial cuts to Foster but mortal wounds to Castilleja, police said. The suspect then called police to "report she had been assaulted in her driveway when she arrived home from work" and that the two alleged victims had been messaging her on social media "stating they want to fight her," authorities said. According to Live Oak police Lt. Matt Malone, the victims went to Northeast Methodist Hospital. They told officers they had been "stabbed after 'jumping' a girl at her house," according to a police report. Paramedics took Castilleja to San Antonio Military Medical Center, where she was pronounced dead at 2 a.m. Friday. Officers went to the suspect's home and found the crime scene in the driveway. They discovered the "murder weapon" at the scene, according to the preliminary report. The 16-year-old suspect was then arrested in connection with the stabbings and charged with homicide.