A preflop movie: KQs, 3 bets, and suicide all-ins

[jesse8888]

Villain in this hand has been hard to read. I think he's a pf lag (raising stuff like KTo), but I'm yet to see him 3-bet anything preflop (in about an hour). After the flop he seems...well, unpredictable.

Hero raises UTG+1 with KQs. Folds to Villain in LP (CO I think), who makes it three bets. BB suicide all-ins for 4 bets. Hero ???. Cap is 5 bets at this fine establishment.

Edit: This is my standard 6/12 live game.