IMDb lists 109 roles as an actor, from Night in Manhattan (1937) to Final Verdict (1991). The Four Horsemen of the Apocalypse (1962), Midway (1976) and Superman (1978) are the only ones I can say for sure I've seen, though I'm sure there are others. According to The Herald:
Gilda was not Ford's only classic noir. He also starred in Fritz Lang's The Big Heat, with Gloria Grahame, Jocelyn Brando and Lee Marvin. He played a police officer who is driven over the edge when his wife (Brando) is killed by a bomb intended for him. He pursues a relentless course of vengeance, leaving death and mayhem in his wake. He was reunited with Lang and Grahame on Human Desire (1954), an impressively seedy tale of adultery and murder.
Other films include A Stolen Life (1946) and Frank Capra's Pockeful of Miracles (1961), both of which co-starred Bette Davis; The Teahouse of the August Moon (1956), with Marlon Brando; and the westerns The Man from Colorado (1948), The Fastest Gun Alive (1956), Cowboy (1958) and Day of the Evil Gun (1968). He also starred in the 1960 remake of Cimarron.
Neither The Herald, the Scotsman nor the Washington Post lists a cause of death.
Edit: See also this post, from LawDog.