Updated

Chicago's Fourth of July weekend death toll has climbed to 15 with the death of a man who was shot just before midnight Sunday.

The Cook County Medical Examiner's Office says 25-year-old William Allen was pronounced dead shortly before 2:30 p.m. on Monday afternoon. Police say Allen was shot Sunday night.

Allen was one of more than 50 people shot over the long holiday weekend. The killings continued Monday with the slayings of three people — the first two early Monday and the third on Monday night on Chicago's South Side.

The Chicago Sun-Times reports that the latest victim was a 19-year-old woman who was shot in the back by a gunman who rode up on a bicycle and opened fire.