Villain in the hand is a reg but a little more loose and passive then normal. UTG raiser was a looser-aggressive regular.

1) Preflop standard?

2) What do you do on the river?

PokerStars No-Limit Hold'em, $4.00 BB (9 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

BB ($400)
UTG ($400)
UTG+1 ($400)
MP1 ($506.20)
MP2 ($419)
Hero (MP3) ($730.30)
CO ($583)
Button ($463.20)
SB ($396)

Preflop: Hero is MP3 with K, K
UTG bets $10, 3 folds, Hero calls $10, CO raises to $44, 4 folds, Hero calls $34

Flop: ($104) 10, 8, 3 (2 players)
Hero checks, CO checks

Turn: ($104) Q (2 players)
Hero bets $74, CO calls $74

River: ($252) 6 (2 players)
Hero bets $88, CO raises to $465 (All-In), Hero folds

Total pot: $428 | Rake: $3