One teenager died and a second was seriously injured Friday evening when they tried to jump between the roofs of two buildings in Brooklyn — and fell four stories into a rear alley.

A 13-year-old who suffered severe head and torso injuries died at Kings County Hospital, sources said. A 15-year-old suffered pelvis injuries and was in serious condition.

Their deadly stunt took place on a residential street in Bushwick at about 5:30 p.m. The names of the youngsters were withheld pending family notification.