NL100: Call this river in the BB?

[funneldave]

I was running at 14/9 ish over 100 hands or so, villain at 33/1/1. Wasnt really sure where I was after turn check and villains bet, should I have raised him and folded to further aggresion, and do I call the river bet?

Party Poker, $0.50/$1 NL Hold'em Cash Game, 9 Players
LeggoPoker Hand History Converter

MP2: $109.13
CO: $21.08
BTN: $143.69
SB: $19
Hero (BB): $216.96
UTG: $51.38
UTG+1: $118.60
UTG+2: $23.70
MP1: $100

Pre-Flop: K[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BB)
UTG folds, UTG+1 calls $1, 2 folds, MP2 calls $1, CO folds, BTN calls $1, SB folds, Hero checks

Flop: ($4.50) K[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/spade.gif[/img] (4 Players)
<font color="red">Hero bets $4</font>, UTG+1 folds, MP2 calls $4, BTN calls $4

Turn: ($16.50) 2[img]/images/graemlins/diamond.gif[/img] (3 Players)
Hero checks, MP2 checks, <font color="red">BTN bets $6</font>, Hero calls $6, MP2 folds

River: ($28.50) 8[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets $15</font>,Hero?