MILWAUKEE (CBS 58) -- A 24-year-old pedestrian died and a bystander who stopped to help was injured after two separate cars hit them near Ruby and Teutonia avenues on Monday night, Sept. 7, according to Milwaukee police.

Police say a car traveling south hit the pedestrian at around 11:15 p.m. and fled the scene. A witness stopped to help the victim, and while doing so, a second car, also traveling south, hit both the witness and the pedestrian.

The pedestrian was pronounced dead at the scene.

The 44-year-old witness was taken to a hospital with non-life-threatening injuries. The driver of the second car remained on scene and is cooperating with the investigation. Police are still searching for the driver involved in the initial crash.

Anyone with information is asked to call MPD at (414) 935-7360. Anonymous tips can be submitted by calling Crime Stoppers at (414) 224-8477 or by using the P3 Tips online service.