Villain is 24/15/5. He's never 4-bet over 100+ hands.

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

Stack sizes:
UTG: $103.40
UTG+1: $170
CO: $26.60
Hero: $98.50
SB: $87.10
BB: $64.10

Pre-flop: (6 players) Hero is Button with A K
UTG folds, UTG+1 raises to $4.5, CO folds, Hero raises to $16, 2 folds, UTG+1 raises all-in $170, Hero ???