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 1993 to 1999, and was succeeded by Homicide: The Movie, which also acted as the de facto series finale. The series was originally based on David Simon's book Homicide: A Year on the Killing Streets. Many of the characters and stories used throughout the show were based on events depicted in the book.