"He's got a 100-yard stare. He's staring blankly," [Fraternal Order of Police spokesman Pat] Camden said of the teen. "[He] walked up to a car and stabbed the tire of the car and kept walking."

Officers remained in their car and followed McDonald as he walked south on Pulaski Road. More officers arrived and police tried to box the teen in with two squad cars, Camden said. McDonald punctured one of the squad car's front passenger-side tires and damaged the front windshield, police and Camden said.

Officers got out of their car and began approaching McDonald, again telling him to drop the knife, Camden said. The boy allegedly lunged at police, and one of the officers opened fire.

McDonald was shot in the chest and taken to Mount Sinai Hospital, where he was pronounced dead at 10:42 p.m.