A top athlete at Brown University, Don Haggerty performed military service and did stage work before his movie-acting debut in 1947. Free-lancing, Haggerty put in time at virtually every studio from Republic to MGM, playing roles of varying sizes in films like Sands of Iwo Jima (1949) The Asphalt Jungle (1951), Angels in the Outfield (1951) and The Narrow Margin (1952). Most often, he was cast as a big-city detective or rugged westerner. During the first (1955-56) season of TV's The Life and Legend of Wyatt Earp, Haggerty showed up semi-regularly as Marsh Murdock. Don Haggerty was the father of Grizzly Adams star Dan Haggerty.