River Play Vs LAG

[LouderThanBombs]

Villain very laggy around 38/20 i'm running really cold so only 18/14 usually 26/21

Full Tilt Poker - No Limit Hold'em Cash Game - $0.05/$0.10 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $9.15
BB: $4.90
UTG: $26.40
MP: $8.75
CO: $7.80
Hero (BTN): $10.65

Preflop: Hero is dealt T[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] (6 Players)
UTG folds, <font color="red">MP raises to $0.30</font>, CO folds, <font color="red">Hero raises to $0.90</font>, 2 folds, MP calls $0.60
Uncalled bet of $0.00 returned to Hero

Flop: ($1.95) T[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/heart.gif[/img] (2 Players)
MP checks, <font color="red">Hero bets $1.30</font>, MP calls $1.30

Turn: ($4.55) T[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img] (2 Players)
MP checks, Hero checks

River: ($4.55) T[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img] (2 Players)
MP checks, <font color="red">Hero???

Should I have bet the turn, as played should I give up now or bet the river? <font color="black"> </font>