Authorities say it was 26-year-old Stephen Guillermo who was shot to death by a neighbor as he attempted to enter the wrong apartment after a night of drinking over the weekend.
Police were called out to an apartment building on the 900 block of Mission Street at about 1:30 a.m. on Saturday on reports of a shooting. When they arrived, the found Guillermo inside an apartment unit that wasn't his. He was pronounced dead at the scene.
Police later arrested Guillermo's neighbor, 68-year-old Amisi Sudi Kachepa on suspicion of homicide.
Guillermo's family told the Chron that he had been out drinking with friends that night and when he returned to his building, he pressed the wrong button in the elevator and ended up on the third floor instead of the fifth floor where he lived with his brother and sister.
He then mistakenly went to the unit that was in the same location as his apartment two stories above. That's when he was shot, police say.
According to the Chron, Kachepa was blaming Guillermo, a San Francisco State student, for breaking his doorknob, which was missing on Saturday morning.
Police are still investigating the shooting. Anyone with information about the case is asked to call SFPD at 575-4444.