KK vs short fish line check

[checktheriver]

Villain was the type of fish who will limp/call with ~atc preflop, but then goes into fit-or-fold mode postflop.
I didn't bet more on turn cause I didn't want to commit to a push.
By the river I felt that I was crushed against his range so I chose to just check/fold.

Is this OK ?

Poker Stars, $0.50/$1 NL Hold'em Cash Game, 4 Players
LeggoPoker Hand History Converter

UTG: $60.65
BTN: $336.25
Hero (SB): $109
BB: $111.40

Pre-Flop: K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img] dealt to Hero (SB)
UTG calls $1, BTN folds, <font color="red">Hero raises to $6</font>, BB folds, UTG calls $5

Flop: ($13) 4[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $9</font>, UTG calls $9

Turn: ($31) A[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $17</font>, UTG calls $17

River: ($65) 8[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">UTG bets $28.65 and is All-In</font>, Hero folds

Results: $65 Pot ($2 Rake)
UTG mucked and WON $63 (+$31 NET)