Only had 26 hands on villain. He was 15/8 and this was the first 3bet he had faced. This was the first opportunity he had to donk a flop and done it, he had a 100% cbet on flop, 2/2. That's pretty much all I got on him.

PokerStars No-Limit Hold'em, $0.02 BB (6 handed) - PokerStars Converter Tool from FlopTurnRiver.com

CO ($1.66)
Button ($2.27)
SB ($2.01)
BB ($4.80)
UTG ($2.47)
Hero (MP) ($2.25)

Preflop: Hero is MP with K, K
UTG bets $0.06, Hero raises to $0.18, 4 folds, UTG calls $0.12

Flop: ($0.39) 9, 4, 8 (2 players)
UTG bets $0.18, Hero calls $0.18

Turn: ($0.75) 10 (2 players)
UTG checks, Hero bets $0.50, UTG calls $0.50

River: ($1.75) J (2 players)
UTG bets $1.61 (All-In), Hero ???

Pretty sure I am beat on the river, just wondering if my line was OK and what ranges people would assign villain.