An 18-year-old man was shot multiple times and killed at a park in Southwest Philadelphia Monday night, police said. 

Detectives said Anthony Jerome Sharpe Jr. of Smyrna, Delaware, was sitting near the slides at Russell DeRitis Playground along Grays Avenue, when around 9 p.m., a gunman snuck up behind him and shot him several times. 

He was hit in the face, head, back and torso.

Police rushed the victim to the Penn Presbyterian Medical Center, where he was pronounced dead at 9:05 p.m.

Police real-time crime cameras recorded the shooting, and the footage appears to show the shooter sneaking up behind the victim and shooting multiple times at close range, Philadelphia Chief Inspector Scott Small said. The shooter then fled on foot. 

Police found several spent shell casings from a semi-automatic weapon at the scene. 

"The scene consists of nine spent shell casings, all just a few feet or few inches away from where he was lying, so clearly the shooter was standing very close to this victim," Small said. 

A cellphone was also found at the scene, and detectives are talking to residents who live nearby to see if anyone saw or heard anything, Small said. Investigators will also try to obtain video from cameras at the playground.