Multitabling too much for solid reads, but villain had won a big pot earlier with a set... he bought in 60bbish, doubled up

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP ($90.20)
CO ($18.50)
Button ($49.95)
SB ($170.40)
Hero ($192.40)
UTG ($166.65)

Preflop: Hero is BB with A, A.
UTG raises to $4, 4 folds, Hero raises to $15, UTG calls $11.

Flop: ($30.50) 4, 9, K (2 players)
Hero bets $15, UTG calls $15.

Turn: ($60.50) 3 (2 players)
Hero bets $27, UTG calls $27.

River: ($114.50) T (2 players)
Hero checks, UTG bets $109.65 (All-In), Hero???