I happened to watch Alcatraz for the first time tonight, and I thought I recognized Blu Mankuma (FK's Captain Reese) as the piano player in one brief scene. I wasn't positive, but the voice... However, IMDB does not credit anyone with that role on the episode's cast list, and Mankuma's own IMDB page lists only Fringe as a 2012 credit.
Did anyone else hear/see what I heard/saw? Or can you properly identify the actor in that role?
Addendum: Per wiliqueen, Blu Mankuma confirmed this appearance on Facebook.