Private Eye or PI.
In the episode "Witness" he plays a detective. His name appears in the opening credits.
because he was a detective person
A person that solves mysteries is a detective.
Someone who solves crimes is a detective.
luther
The proper noun for the common noun detective would be the title of or name of a specific detective, such as Detective Lennie Briscoe.
veronique
"Blue Moon Detective Agency"
No, he is an actor portraying a detective.
Goon Detective Agency should be good enough.
Steve R
Frank.