To Catch a Killer is a two-part television film from 1992, directed by Eric Till and starring Brian Dennehy and Michael Riley. It is based on the true story of the pursuit of American serial killer John Wayne Gacy.

Brian Manion Dennehy was an American actor of stage, television, and film. He won two Tony Awards, an Olivier Award, and a Golden Globe, and received six Primetime Emmy Award nominations. Dennehy had roles in over 180 films and in many television and stage productions. His film roles included First Blood (1982), Gorky Park (1983), Silverado (1985), Cocoon (1985), F/X (1986), Presumed Innocent (1990), Tommy Boy (1995), Romeo + Juliet (1996), Ratatouille (2007), and Knight of Cups (2015). Dennehy won the Golden Globe Award for Best Actor in a Miniseries or Television Film for his role as Willy Loman in the television film Death of a Salesman (2000). Dennehy's final film was Driveways (2020), in which he plays a veteran of the Korean War, living alone, who befriends a young, shy boy who has come with his mother to clean out his deceased aunt's hoarded home.