Claudette confirmed tonight that she knew she was sending Fatboy to his death (it took me a few seconds to work out who they meant by "Arthur"). She's got absolutely no remorse for his or Henry's death, or for ruthlessly lying to Vincent all these years. I can't say I blame Vincent for throttling her after that extreme provocation!
I'm not yet convinced he's outright evil. I think there's still a chance he's under Lucas' spell and desperate for his approval by bringing Denise along. He's convinced Lucas has changed, so he doesn't believe he's taking Denise and JJ along with a killer.
I guess we'll find out for sure one way or the other tomorrow...