The newly-named market manager for CBS Radio is John Sheehan, who's been overseeing KMOX sisters KEZK (soft AC at 102.5) and hot AC "Y98" KYKY. The staff at heritage news/talk KMOX (1120) was informed of Ervin's departure this morning. In 2005, Dave replaced Tom Langmyer as general manager, after Langmyer left to run WGN, Chicago for Tribune. Ervin had previously been the market manager Radio One in St. Louis, and he'd also been a market manager there and in Los Angeles for Bonneville.