Alias the Champ

Alias the Champ is a 1949 American crime film directed by George Blair and written by Albert DeMond.

The film stars Robert Rockwell, Barbra Fuller, Audrey Long, James Nolan, John Harmon, Sammy Menacker and Joseph Crehan.

Taking a special interest in George's match is a police lieutenant, Ron Peterson, who is keeping an eye on everybody: mobster Al Merlo, his moll Colette LaRue and another wrestling star, Sammy Menacker, who is dating Lorraine.

George is clearly the prime suspect if this is a murder, while Peterson gets in hot water at the police department for proposing the match in the first place.

He finds the pen Colette used to get Sam's autograph and realizes what happened: It's been poisoned.