Education
Fordham University School of Law.
Fordham University School of Law.
McMahon became interested in acting when he was a student at Fordham University School of Law. In his early career he mostly played thugs or jailbirds, but in 1949 he starred in his most acclaimed role, as Lieutenant Monaghan in the drama play Detective Story and in 1951 he reprised his character in Paramount Pictures" film version Detective Story, alongside Kirk Douglas and Eleanor Parker. McMahon also starred on television, in the American Broadcasting Company police series Naked City as Lieutenant
Mike Parker, a gruff, no-nonsense, but warmhearted cop"s cop, interested only in justice and doing the job according to the proper rules of the game.
In 1964, McMahon played Hank McClure, a police contact in the 13-week Columbia Broadcasting System drama series, Mr. Broadway, with Craig Stevens.