College student, 22, dies after her boyfriend grew paranoid on LSD and allegedly strangled, punched and kicked her using moves he learned in taekwondo A University of Washington student, 22, died after her boyfriend took LSD and attacked her, Seattle police said. Katy Straalsund, 22, took the hallucinogenic drug on Saturday with Casey S. Henderson, her boyfriend of six months, the Tri-City Herald reported. He became paranoid and thought Straalsund was plotting against him, so he repeatedly punched and kicked her utilizing moves he learned in taekwondo, a probable cause document stated. Police arrived at her apartment after someone reported a disturbance on Sunday and saw Henderson choking Straalsund, who was found without a pulse. She died in the hospital on Tuesday afternoon after being put on life support. +4 Casey S. Henderson (left) is accused of beating and strangling his girlfriend Katy Straalsund (right) after they took LSD together on Saturday +4 +4 Straalsund, 22, and Henderson, 21, (left and right) were both students at the University of Washington. They had been dating for about six months Henderson, 21, who is also a student at UW, is being held on $1million bail. He is due to be charged on Wednesday, and the case is being investigated as a homicide, according to the Seattle Times. Henderson told police they purchased LSD from someone on the street on Saturday afternoon, and returned to her apartment in the evening. Henderson said things 'started to get weird' and he began thinking Straalsund was 'plotting against him' so he repeatedly used taekwondo moves to punch and kick her, according to the police. He said the two didn't sleep, and someone told a 911 dispatcher at 2.10pm on Sunday that he heard a man yelling 'You wanna die?' and 'I will kill you'. Police arrived and heard shouts and groans, but when they knocked a second time, the noises stopped. They saw Henderson choking Straalsund through a glass door when they went around the building, and she was found without a pulse. There were abrasions and bruises on her neck and face from severe head and facial trauma, according to reports cited by Seattlepi.com. Straalsund, who was taken to the hospital in critical condition, and had no brain function and needed a life support ventilator to help her breathe, court records stated. When Henderson was questioned by the police, he asked them several times whether his girlfriend was still alive, and said: 'I thought I killed her.' He also admitted the fracture to his wrist was caused by attacking his girlfriend, Seattlepi.com reported. +4 Henderson (right, with Straalsund), told police he was convinced his girlfriend was 'plotting against him', so he punched and kicked her repeatedly using taekwondo moves, causing severe head and facial trauma Police saw Henderson choking Straalsund (left and right), who was found with no pulse. She died on Tuesday after being placed on life support Straalsund died on Tuesday at Harborview Medical Center in Seattle. On her Facebook page, she posted just four days before her death: 'Life is good! It's all about the journey and experiences that you collect as you go through life. 'Take solace in the fact that things will never be exactly the same as the are now-- whether that's in career, health and fitness, relationships, etc. 'Everything is evolving constantly in this crazy, fast beautiful life.' She also wrote about getting a perfect score on her neuroscience final, and shared in February that she had been accepted in a program to teach English in Barcelona, Spain.