His name was John O'Leary and since 1975, he's worked for a large number of Motown stations, including WWWW, WLLZ, WCSX and WABX. His body was discovered on Sunday when police came to check on his whereabouts. He was 68 and had been doing voiceover work for the past few years. A suspect is in custody, but no motive has been released. 

Longtime Detroit disc jockey stabbed to death; police say suspect in custody