Is a check behind saving money here?

Flopped the str8, but by the river i was concerned about my hand with 2 callers.... Is the checkbehind a smart move, or am I missing out? I guess im asking how often does one of the other 2 callers have the flush, AK, or pair+Straight draw(which boats on river)

PokerStars No-Limit Hold'em, $1.00 BB (9 handed) converter

saw flop|<font color="#C00000">saw showdown</font>

CO ($167.20)
<font color="#C00000">Hero ($55.90)</font>
SB ($63.70)
BB ($104.25)
<font color="#C00000">UTG ($32)</font>
UTG+1 ($98.50)
MP1 ($236.95)
<font color="#C00000">MP2 ($38.80)</font>
MP3 ($104.35)

Preflop: Hero is Button with K[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/club.gif[/img].
UTG calls $1, <font color="#666666">1 fold</font>, MP1 calls $1, MP2 calls $1, <font color="#666666">2 folds</font>, Hero calls $1, <font color="#666666">1 fold</font>, BB checks.

Flop: ($5.50) Q[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, <font color="#CC3333">UTG bets $2</font>, MP1 calls $2, MP2 calls $2, <font color="#CC3333">Hero raises to $8</font>, BB folds, UTG calls $6, MP1 folds, MP2 calls $6.

Turn: ($31.50) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, MP2 checks, <font color="#CC3333">Hero bets $12</font>, UTG calls $12, MP2 calls $12.

River: ($67.50) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, MP2 checks, Hero checks.

Final Pot: $67.50

Results in white below: <font color="#FFFFFF">
UTG has Qs Ah (two pair, queens and jacks).
MP2 has 9d Th (two pair, jacks and tens).
Hero has Kd Jc (straight, king high).
Outcome: Hero wins $67.50. </font>