Horrigan is a Special Agent for the CPD and Wilburn's mentor. He comes across as antisocial and rude, but also has a very inquisitive frame of mind. He's a straight-shooter, always to the point and always working to complete a mission.

Horrigan was an orphan and grew up in a gang, eventually he grew up to change his ways and started working in the CPD. At first he was a believer of 'orders are orders' and would do things without question, but then he learned to think for himself. This granted him what many lacked: Creativity.

He rose through the ranks as his life outside the force disappeared, until all he had left was work. Horrigan grew to accept this, and worked on harder cases, becoming Warden's partner. Eventually Warden felt he taught Horrigan all he knew, leaving Horrigan to be a mentor himself, which is where Wilburn came in.