The Thirteenth Man on AllMovie

Weldon Heyburn, poverty row's answer to Clark Gable, stars in this whodunit, in which the victim, a crusading district attorney (William Gould), is murdered by a dart laced with curare while attending a prizefight. The D.A., Sutherland, was about to arrest yet another gangland boss in a crackdown that hitherto had netted an even dozen. But is the gang behind the murder or is someone else responsible? Radio personality Swifty Taylor (Heyburn) discovers the truth and is about to announce the murderer's identity on the air when yet another killing occurs.