this is from memory so numbers and such may not be completely accurate.

Bodog fullring 50$ max buy in, relatively new to table.

hero has KK and is UTG with 80 blind stack after having just doubled up, villian is BB and is on a 400 blind stack (with 100 blinds as max buy in, villian is either a good player or on a hot deck or a little of both. considering that it's Bodog 50$.....).

hero raises 4 blinds, MP calls, villian calls.

flop is T 8 7

villian checks, hero fires 3/4 of the pot, MP calls, villian calls

turn is 8

vilian checks, hero fires 2/3 of the pot, MP folds, villian takes a little time then raises the amount hero bet.

hero's stack is approximately half the pot and twice what he needs to call to see the river.

what does hero do?