Richard Jay Belzer was an American actor, comedian, and author. He was best known for his role as BPD Detective, NYPD Detective/sergeant and investigator John Munch, whom he portrayed for 23 years in the NBC police drama series Homicide: Life on the Street, Law & Order: Special Victims Unit and several guest appearances on other series.

John Munch is a fictional character played by actor Richard Belzer. Munch first appeared on the American crime drama television series Homicide: Life on the Street on NBC. A regular through the entire run of the series from 1993 to 1999, Munch is a cynical detective in the Baltimore Police Department's Homicide unit, and a firm believer in conspiracy theories. He is originally partnered with Detective Stanley Bolander. Munch is based on Jay Landsman, a central figure in David Simon's 1991 true crime book Homicide: A Year on the Killing Streets.