In last week’s Mayor of Kingstown recap, I mentioned the show’s high-profile new cast members: Lennie James! Laura Benanti! Edie frickin’ Falco! But I seem to have missed somebody important — someone who may be lower-profile as an actor, but who, so far, is a very big deal as a season-four character. Say hello, everybody, to Derek Rivera.

Rivera’s character hasn’t been officially named in the show yet, but according to the closing credits, he’s playing Cortez, a hitman. We met Cortez in last week’s “Coming ‘Round the Mountain,” when he took shots at Bunny’s caravan and was chased down by the KPD. At the time, I wondered if he might be working with the newcomer Frank Moses, who had only appeared in one scene and hadn’t made any intentions known. By the end of this week’s “Promises to K

See Full Page