In addition to acting in more than 40 feature films, he starred in the landmark ABC-TV television series The Untouchables (1959–1963), for which he won the 1960 Emmy Award for Best Actor in a Dramatic Series, and later hosted/narrated true crime series Unsolved Mysteries (1987–2002).
Udover at optræde i mere end 40 spillefilm, spillede han i ABC-tv-serien The Untouchables (1959-63), som han vandt 1960 Emmy Award for bedste skuespiller i en dramaserie og senere vært vært for Unsolved Mysteries ( 1987-2002).