When Did Michael O'Sullivan Die?

Michael O'Sullivan was an American actor, "larger than life," who appeared on Broadway, at Lincoln Center, on the London stage, at San Francisco's Actor's Workshop and in many regional theaters and festivals of America throughout his brief career in the late 1950s and '60s. Arguably, his most famous role was in the 1968 film Hang 'Em High as Francis Elroy Duffy, a condemned prisoner whose final words before hanging warn of the dangers of drinking alcohol.