Fox’s Batman prequel Gotham has cast another key player, Donal Logue will portray Det. Harvey Bullock, Jim Gordon’s partner on the force, according to The Hollywood Reporter.

Bullock is described as an old-school, loose cannon; but also functions as a mentor to his young partner.  Logue should have no problem with that role, having appeared as former U.S. Marshall Lee Toric on Sons of Anarchy, ex-cop and recovering alcoholic Hank Dolworth on Terriers, and even the vampire Quinn in the original Blade movie.
Logue joins a cast that also includes Ben McKenzie as Gordon, and several others who were also announced in the last week (see "Casting Updates for 'Gotham'").