A deer in headlights

[cartman]

Villain is unknown.

PREFLOP:
UTG+1 open limps, everyone else folds and Hero raises in the BB with A [img]/images/graemlins/heart.gif[/img]J [img]/images/graemlins/heart.gif[/img].

FLOP:J [img]/images/graemlins/spade.gif[/img]8 [img]/images/graemlins/diamond.gif[/img]4 [img]/images/graemlins/club.gif[/img]
Hero bets, Villain calls.

TURN: 2 [img]/images/graemlins/club.gif[/img]
Hero bets, Villain calls.

RIVER: K [img]/images/graemlins/diamond.gif[/img]
Hero?


If you bet do you call a raise?

What is your river line if the cards were identical but you had raised UTG and Villain had cold-called on the button?


Thanks,
Cartman