Boomerang (1947 film)

Boomerang is a 1947 film based on the true story of a vagrant who was accused of murder, only to be found innocent through the efforts of the prosecutor. It stars Dana Andrews, Lee J. Cobb, Karl Malden, Arthur Kennedy and Jane Wyatt.

A priest is shot dead on a Bridgeport, Connecticut street at night. The police, led by Chief Robinson Cobb, fail to immediately find the murderer. It soon becomes a political hot potato, with the police accused of incompetence, and the citys reformminded administration comes under attack. Robinson and the prosecutor Henry Harvey Andrews come under severe pressure by political leaders to find the killer or bring in outside help.After strenuous efforts yield nothing, a vagrant exserviceman, John Waldron Kennedy, is apprehended. He is interrogated for two days by police until, deprived of sleep, he confesses. The evidence seems solid, and a gun in his possession is believed to be the gun that was used in the shooting. ........

Source: Wikipedia