0,15/0,30 Fixed-Limit Hold'em (10 handed)
Hand recorder used for this poker hand: Texas Grabem 1.7 by www.pokerstrategy.cc.
Preflop: Hero is MP2 with J♦, J♠
UTG folds, UTG+1 calls, 2 folds, Hero raises, 5 folds, UTG+1 calls.
Flop: (5,47 SB) 5♥, 4♠, T♣ (2 players)
UTG+1 checks, Hero bets, UTG+1 calls.
Turn: (3,73 BB) 9♦ (2 players)
UTG+1 checks, Hero bets, UTG+1 calls.
River: (5,73 BB) Q♣ (2 players)
UTG+1 bets, Hero calls.
Final Pot: 7,73 BB
I hate when that happens...
It's hard to think of a hand he would donk the river with that you beat except a pure bluff. You're most probably beaten by a Q or a straight. Still, heads-up and at 6:1 I would call it like you did.
I know that result "isn't important", but he had AT.
edit: Ups, sorry for pressing button which erased that check mark... Didn't know that 
The button should be pressed if you want us to reread the thread for example if you have another quetion so don't hesitate to use it. 
Btw another proof that you can't fold the river for just 1 bet. With a good pair in a heads up ituation.
