Hero and villain have circa 25k....21 left blinds 600/1200
Hero

limps utg (have everyone covered apart from villain, who has same)...been playing tight for last couple of rounds
Villain makes it 4k been playing verry lag.
Hero calls...flop comes

.
Hero checks....villain bets 5.5k, hero calls
Turn

Hero checks....Villain moves all in
Hero?