A Close Call for Boston Blackie (1946)

"BLACKIE TRIPS A BLONDE .... To Trap a Killer!"

Blackie runs into a woman he formally loved who now is married with a kid. When her husband gets out of prison he's killed in Blackie's apartment and of course the police thing Blackie pulled the trigger. Blackie must set out to prove his innocence as well as capture the real killers.