Homicide: Life on the Street is an American police procedural television series chronicling the work of a fictional version of the Baltimore Police Department's Homicide Unit. It ran for seven seasons (122 episodes) on NBC from January 31, 1993 to May 21, 1999, and was succeeded by Homicide: The Movie (2000), which served as the de facto series finale. The series was originally based on David Simon's book Homicide: A Year on the Killing Streets (1991). Many of the characters and stories used throughout the show were based on events depicted in the book.