ST. LOUIS (AP) — A St. Louis man is dead after allegedly punching a man in a wheelchair — only to have the wheelchair-bound man pull out a gun and shoot him.

The shooting happened Monday. Police say 39-year-old Michael Johnson was arguing with 33-year-old Secoy Anthony Webb, who uses a wheelchair.

Police say Johnson began striking Webb in the face. Webb grabbed a gun and shot Johnson in the back.

Johnson died Wednesday in a hospital.

Webb is charged with unlawful possession of a firearm, and jailed on $30,000 cash-only bond. Police say the shooting remains under investigation.