There are several detective characters with the surname Turlington in American Dad. They look identical, and act in very similar ways.
They have similar mannerisms including speaking in a low voice and being suspicious of almost everything and everyone. All Turlingtons seem to have had emotional problems pertaining to their mothers, often trying to talk to them in heaven, asking for help or guidance. This, along with their physical appearances, implies that the Turlingtons are siblings.
The First Turlington
The first Turlington appears in "Meter Made", working at Parking Internal Affairs. He is suspicious of Stan when the quarter count drops; in an example, Turlington tells Stan that he knows he could not be the culprit and immediately afterwards says that he is suspicious of him. At the end of the episode, he proclaims that he was suspicious of Stan but let his suspicions go after learning he is in the CIA. The given name of this particular Turlington is not revealed.
The second Turlington appears in "Chimdale" and is identified as "Ron" by Mr. Chimdale, the manager of the Chimdale Spa.
In "Chimdale", Turlington's role is that of a spa detective. He is immediately suspicious of Roger and Francine, who smuggled Hayley to the spa. In addition, he is unable to find a pistachio thief and upon discovering Hayley asks the Smiths to help him. However, he instantly realizes that Mr. Chimdale was the thief; Chimdale had devised an "elaborate" mystery to make Turlington the greatest spa detective since his father.