Rivered 2Pair vs triple Barrel

GG Poker - $0.05 Ante $0.02 NL - Holdem - 9 players
Hand converted by PokerTracker 4

SB: 144 BB
BB: 128.6 BB
UTG: 200 BB
UTG+1: 132.2 BB
MP: 196.2 BB
MP+1: 40.8 BB
MP+2: 393 BB
Hero (CO): 276.2 BB
BTN: 200 BB

9 players post ante of 0.4 BB, SB posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 5 BB) Hero has K♠ J♥

fold, fold, MP raises to 3.2 BB, fold, MP+2 calls 3.2 BB, Hero calls 3.2 BB, fold, fold, BB calls 2.2 BB

Flop: (16.8 BB, 4 players) 5♥ Q♠ K♥
BB checks, MP checks, MP+2 bets 5.6 BB, Hero calls 5.6 BB, fold, fold

Turn: (28 BB, 2 players) 4♦
MP+2 bets 12.4 BB, Hero calls 12.4 BB

River: (52.8 BB, 2 players) J♦
MP+2 bets 43 BB, Hero ?

Villain is unknown. 4way + triple barrel is usually very strong on my limit. Seems like my rivered 2pair is just a bluffcatcher at this point. I lose to 55 (3 combos), KQ (6) and some gutshot bluffs that improve on the river T9s (3), AT (up to 16). Bluffs are possible from busted hearts or JT, AJ, some 5x combo. Call or fold?