Stuck in a hole 100nl

[Womble]

Party Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 6 Players - (LegoPoker HH Converter)

SB: $113.89
BB: $99.50
UTG: $84.00
MP: $60.35
Hero (CO): $106.30
BTN: $102.08

Reads: <font color="blue">Interesting spot this and probably unlikely to come up again.

2nd orbit at the table so no reads or stats. Thought my PFR was enough to clear everyone else out of the pot. Did not expect the caller there. On the flop getting over 4:1 do I ahve to call this?</font>

Preflop: Hero is dealt K[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/club.gif[/img] (6 Players)
UTG folds, MP calls $1.00, <font color="red">Hero raises to $5.00</font>, BTN calls $5.00, SB calls $4.50, BB folds, <font color="red">MP raises to $9.00</font>, <font color="red">Hero raises to $40.00</font>, BTN folds, SB calls $35.00, <font color="red">MP raises all-in to $60.35</font>, Hero calls $20.35, SB calls $20.35

Flop: ($187.05) 2[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/club.gif[/img] (3 Players - 1 All-In)
<font color="red">SB bets all-in for $53.54</font>, Hero calls all-in for $45.95
Uncalled bet of $7.59 returned to SB

Turn: ($278.95) 3[img]/images/graemlins/heart.gif[/img] (3 Players - 3 All-In)

River: ($278.95) K[img]/images/graemlins/spade.gif[/img] (3 Players - 3 All-In)

Pot Size: $278.95 ($3 Rake)