Tough River spot. Hard to find bluffs for villain here, should I call or fold river?

50NL, 260 BB effective
Hero is LJ with [Ad Jc]

Preflop:
Hero (LJ) opens 2.5 BB
BTN calls
SB calls
BB folds

Flop (8 BB) Ac Jd 4s
Hero bets 4 BB
BTN calls
SB folds

Turn (16 BB) Ac Jd 4s [Qc]
Hero bets 12 BB
BTN raises to 32BB
Hero calls

River (80 BB) Ac Jd 4s Qc [Qd]
Hero checks
BTN bets 51 BB
Hero??