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Sergeant Murphy is a cocker spaniel/bloodhound mix police dog motorcylist who is often present the street and road scenes. He and his wife, Mrs. Murphy, are married and have a little girl/daughter named Bridget. He is dedicated to his job and his passion for motorcycles is shown in the fact that he wears his crash helmet, even in bed. His name is reflection on the stereotypical Irish-American policeman. He even has an Irish accent. Characters added in April 1969.

He was first appeared in "Sergeant Murphy and the Banana Thief."

He also appeared in Richard Scarry's Best Videos Ever, The Busy World of Richard Scarry, and Busytown Mysteries.