Det. Zack Nichols

After September, 11th 2001, Detective Zack Nichols left the police force to discover the meaning of life. But a cerebral, quirky and efficient cop doesn't stay away for long. Now, Det. Nichols' Socratic approach to crime scene investigation has his new partner, Det. Wheeler, and his old partner, Captain Ross, just trying to keep up.

A child of two psychiatrists, Nichols naturally shunned the shrink profession. It didn't have the closure like solving a crime does, at least for him. Even though becoming a cop was a means of rebellion for Nichols, he has found his father as an expert psychiatric witness in many of the cases he's been involved in.

Whether it's taking in a matinee movie to clear his mind or thinking outside the box about a criminal's motive, Zack Nichols is the x-factor on any crime scene investigation.