The author of such novels as The Killing Season and the best-selling The Domino Principle, Adam Kennedy also wrote screenplays and teleplays and occasionally worked as an actor in films, television, and on-stage. He made his feature film debut in The Court Martial of Billy Mitchell (1955) and made most of his movie appearances during the rest of the '50s. He wrote his first film screenplay for The Dove in 1975. On television, Kennedy appeared on Playhouse 90 and Gunsmoke. He was also a regular on the series The Californian and The Doctors. Kennedy died of a heart attack on October 16, 1997, at the age of 75.