William O'Connell found success as an actor early on, when he was just five years old. In the beginning of his acting career, O'Connell starred in comedies like "Way... Way Out" (1966) starring Jerry Lewis and "It's a Bikini World" (1967) starring Deborah Walley. He worked in television in his early acting career as well, including parts on "The Twilight Zone" (CBS, 1959-1964) and "Batman" (ABC, 1965-68). He kept working in film throughout the sixties and the seventies, starring in the Rock Hudson adaptation "Ice Station Zebra" (1968), the Lee Marvin adaptation "Paint Your Wagon" (1969) and the Jean Simmons drama "The Happy Ending" (1969). He also appeared in "High Plains Drifter" (1973). Film continued to be his passion as he played roles in the action movie "Every Which Way But Loose" (1978) with Clint Eastwood and the comedic adventure "Any Which Way You Can" (1980) with Clint Eastwood. He also was featured in the TV movie "The Dead Don't Die" (NBC, 1974-75). Most recently, O'Connell worked on the Eric Bana dramatic adaptation "Romulus, My Father" (2008).