Barry Sullivan

Film Deaths

Cause for Alarm! (1951) [George Z. Jones]: Collapses and dies from a heart attack after rising out of bed, before he can shoot and kill his wife (Loretta Young); after admitting he has sent a letter to the District Attorney, containing accusations against his wife and the doctor ( Bruce Cowling ) for trying to kill him with overdoses of medication for his heart problems, resulting from suspicion that they were having an affair. (I havent seen the film, but I have read the synopsis off of wikipedia.).
Seven Ways From Sundown (1960) [Jim Flood]: Shot dead by Audie Murphy when he draws on him. (Thanks to Brian).
Pyro (Fuego; Pyro...the Thing without a Face; Wheel of Fire) (1964) [Vance Pierson]: Commits suicide by Jumping from a ferris wheel when cornered by police after Soledad Miranda tries to talk him into surrendering.
Johnny Belinda (1967) [Black MacDonald]: Presumably killed in a struggle with David Carradine. (I haven't seen this myself, but I've seen Charles Bickford's death in the 1948 version)
Take a Hard Ride (La Parola di un fuorilegge....e legge!) (1975) [Kane]: Reportedly shot in the back by Lee Van Cleef (I haven't seen this movie myself) (Thanks to Michael)

Alfred Hitchcock Presents: The $2,000,000 Defense (1958) [Mark Robeson]: Reportedly killed by Leslie Nielsen (I haven't seen this episode myself, but I got the information from the episode guide).
Yuma (1971) [Nels Decker]: Gets an arrow in the back from one of Rudy Diaz' Apaches just as he is about to shoot Clint Walker. (Thanks to Brian)