Michael Emmet Walsh was an American actor who appeared in over 200 films and television series, including supporting roles as Earl Frank in Straight Time (1978), the Madman in The Jerk (1979), Captain Bryant in Blade Runner (1982), Harv in Critters (1986), and Walt Scheel in Christmas with the Kranks (2004). He starred as private detective Loren Visser in Blood Simple (1984), the Coen brothers' first film, for which he won the Independent Spirit Award for Best Male Lead.

Serpico is a 1973 American biographical crime drama film directed by Sidney Lumet and starring Al Pacino in the title role. The screenplay was adapted by Waldo Salt and Norman Wexler from the book of the same name written by Peter Maas with the assistance of its subject, Frank Serpico. The story details Serpico's struggle with corruption within the New York City Police Department during his eleven years of service, and his work as a whistleblower that led to the investigation by the Knapp Commission.