Detective Frank McGraw

Frank McGraw is a local detective who brings Holden and Bill an unsolved case, hoping the Bureau's new profiling methods might succeed where standard police work has stalled. Practical and a little wary of these outsiders' theories, he watches them closely, weighing whether their talk of psychology can actually solve a real crime in his jurisdiction.

Mindhunter thrives on these procedural encounters, and Murphy plays McGraw with the flat, unglamorous authority of a career cop who has seen theories come and go. He grounds the show's more speculative science in local stakes, giving Holden's ideas a skeptical audience whose eventual, grudging interest feels earned rather than convenient.