Police are on the hunt for the gunman they say opened fire Sunday on a basketball court in Harlem, leaving one man dead and three others wounded. They were engaged in a pickup game.

Investigators say the dead teen was shot in the head; he was pronounced dead at Harlem Hospital. A bullet grazed the head of another victim, while the other two were shot in the leg. They're expected to be OK. They range in age from 19 to 23 years-old.

Bullets started flying shortly before 5 p.m. at St. Nicholas Playground South on 7th Avenue (Adam Clayton Powell Jr. Boulevard) and West 129th Street, across from the St. Nicholas Housing Complex and the Salem United Methodist Church.

Detectives have been scouring rooftops for evidence and two suspects who were seen running from the scene.

If you know anything that can help police solve this case, please call Crime Stoppers at 1-800-577-TIPS. All calls are kept confidential. You can also contact police by texting TIP577 to CRIMES, or by going to nypdcrimestoppers.com