Nick Carter, Master Detective

Nick Carter, Master Detective was a Mutual radio crime drama based on tales of the fictional private detective Nick Carter from Street & Smith's dime novels and pulp magazines. Nick Carter first came to radio as The Return of Nick Carter, a reference to the character's pulp origins, but the title was soon changed to Nick Carter, Master Detective. A veteran radio dramatist, Ferrin Fraser, wrote many of the scripts.
more at Great Detectives

WIKIPEDIA

Lon Clark (1912-1998) was a veteran New York radio and stage actor. He was best known for his role in the Nick Carter programs from 1943-55. Outside of this, he appeared as a character actor with distinguished roles in radio programs such as Words at War and later programs such as The CBS Mystery Theatre and Theater Five.