Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
9 players
Converter

Pre-flop: (9 players) Hero is CO with K A
UTG raises to $2, 2 folds, MP2 calls, MP3 folds, Hero raises to $8, 3 folds, UTG calls, MP2 folds.

Flop: 6 A K ($19.5, 2 players)
UTG checks, Hero bets $15, UTG calls.

Turn: Q ($49.5, 2 players)
UTG checks, Hero bets $35, UTG calls.

River: J ($119.5, 2 players)
UTG is all-in $56.75, Hero ???

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I only have 5 hands on the Villian showing him at 80/0.

Do you make this call on the river?