The Santa Cruz County District Attorney's Office deemed a former UC Santa Cruz student competent to stand trial after allegedly killing his girlfriend at Seabright Beach in February 2024. The decision was made Wednesday morning after the results from two mental health evaluations came back. A doctor was appointed to the case and they generated two reports that supported that the suspect was aware of his actions when he allegedly committed the crime. Samuel Brannigan Stone, 20, entered a plea of not guilty for one count of murder with special enhancements for a serious felony violation and a violent felony allegation. Past Coverage | Former UC Santa Cruz student accused of killing girlfriendStone is accused of killing his girlfriend, 21-year-old UC Santa Cruz student, Zainab Mansoor.She was found unconscious by Santa Cruz Police after her boyfriend called 911 and told them "a homicide had just occurred and he was somehow involved," per a Sanat Cruz Police Officer. She was taken to the hospital and put on life support before eventually dying.His next court appearance is scheduled for May 2, 2024. See more coverage of top Central Coast stories here | Download our app.