Timothy "Tim" Bayliss is a fictional detective on Homicide: Life on the Street, played by Kyle Secor and one of the few main characters to last the entire run of the show. He was loosely based on the real-life Det. Thomas Pellegrini from David Simon's book Homicide: A Year on the Killing Streets, though the real detective was reportedly not at all a fan of his fictional alter ego. The character also appeared in the Law & Order episode "Charm City."