70,000 Witnesses on AllMovie

This "gimmick" murder mystery begins during a crucial college football game. Wally Clark (Johnny Mack Brown), the team's star player, is killed just before making the winning touchdown, as the titular 70,000 witnesses look on. Wally's teammate Buck Buchanan (Phillips Holmes), the younger brother of gambler Slip Buchanan (Lew Cody), had previously refused to drug Wally at Slip's bequest. Even so, when Wally drops dead, the leading suspect is poor Buck. It's up to bibulous reporter Johnny Moran (Charles Ruggles) and Wally's sister Dorothy Clark (Dorothy Jordan) to save Buck before local detective Dan McKenna (David Landau) railroads the boy into the electric chair.