A boxer is killed in the ring, and the only clue is a tune that a man was whistling.
Bill Devons
Pauline Ward
Nick Nicholls
Althea Ames
Watchman
Edna Mayberry (as Lynn Roberts)
Albert 'Slats' Keefe
Ralph Mortimer
Captain Joseph Filsom
Tommy Madison - the Champ
Ace Cummings
Announcer Dan Tobey
Max
Smiley Burnette
Jake
Max (as Al Bayne)
