Hero folds?

[JaneTheHot]

PokerStars 0.50/1.00 Hold'em (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is MP3 with A[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/heart.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, UTG+2 calls, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">3 folds</font>, BB calls, UTG calls, UTG+2 calls.

Flop: (8.50 SB) 7[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, UTG+2 checks, Hero checks.

Turn: (4.25 BB) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, <font color="#CC3333">UTG+2 bets</font>, Hero calls, BB folds, UTG calls.

River: (7.25 BB) 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">UTG+2 bets</font>, Hero calls, <font color="#CC3333">UTG raises</font>, UTG+2 calls, Hero folds.

Final Pot: 12.25 BB

The guy who CR me on the river is known to me as a wild player, however, I also saw that he can be tricky at some stages, especially turn and river. On the other hand, the player that bet the river is known for his straightforward play, he bets when he hits, and check-folds when he misses.
I am interested in River play the most. On the other hand, if I made some mistakes please say so.