Father Martin Burke was a prizefighter and occasional actor who was a sparring partner of heavyweight champ Jack Dempsey.
Both television shows for which he's most famous, he was a replacement for the lead. In Naked City he replaced James Franciscus, and in 12 O'Clock High he replaced Robert Lansing.
Biography states Paul Burke joined the cast of Naked City as partner of Lt. Mike Parker played by Horace McMahon, when in fact Burke's Partner was Detective Frank Arcaro played by Harry Bellaver. The character Lt. Mike Parker was their superior during the rest of the series.