Why was this guy arrested? Was it because of the weapon used? Self defense incidents have an eccentric arrest correlation.

The incident began when Medina went to his bedroom with his girlfriend after getting into an argument with his roommate, Joshua Sutter, according to the Sheriff’s Department.

Sutter, 36, followed and forced open the door to the bedroom; Medina took up a sword that he kept next to the door and fatally stabbed Sutter once in the abdomen, authorities said.

Medina called 911 and stayed at the home. He was later interviewed by detectives and booked Sunday at the sheriff’s station in Palmdale. His bail was set at $1 million.

Pretty clearly self defense. What was unclear when he was arrested?