He was transported to a hospital where he died.
Roberts says police searched classrooms and hallways during the lockdown but found no other wounded.
He says fewer than 500 students attending an after-school program were still present when the shooting happened around 2:40 p.m. and would be allowed to leave soon.
Roberts would not release details about how the victim was shot or number of shots.
Authorities have not determined if the man was a student at the high school.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)