KALAMAZOO, Mich. (WOOD) — Kalamazoo police say the body of man found Tuesday inside of a parked vehicle had been there for a long time.

At around 10:30 a.m. officers say they found a man slumped over and unresponsive inside a red pickup truck parked in front of the Planet Fitness located in the 4400 block of Stadium Drive near Drake Road.

There were no signs of foul play, according to a Kalamazoo Department of Public Safety news release.

Police identified the man as 32-year-old Stephen Max Heuer of Edwardsburg.

Family told 24 Hour News 8 that Heuer died of an overdose, but police say an autopsy will be performed to find out the exact cause of death.

Anyone with information is asked to call the Kalamazoo Department of Public Safety at 269.337.8994 or Silent Observer at 269.343.2100.