Villain had only played a few hands and then left soon after this hand - no reads

Cryptologic
Pot Limit Omaha Ring game
Blinds: $0.15/$0.25
10 players


Stack sizes:
UTG: $17.60
UTG+1: $22.30
UTG+2: $38.85
MP1: $24.74
Hero: $19.70
MP3: $4.25
CO: $27.45
Button: $119.39
SB: $26.75
BB: $17.30

Pre-flop: (10 players) Hero is MP2 with
UTG calls, UTG+1 folds, UTG+2 calls, MP1 folds, Hero calls, 2 folds, Button calls, SB calls, BB checks.

Flop: ($1.5, 6 players)
SB checks, BB checks, UTG checks, UTG+2 checks, Hero bets $1.5, 3 folds, UTG calls, UTG+2 folds.

Turn: ($4.5, 2 players)
UTG checks, Hero bets $4.5, UTG calls.

River: ($13.5, 2 players)
UTG is all-in $11.35, Hero ????

Yes, bet the turn. Even against the unlikely straight you're not much worse than 50:50 to win the pot and giving a free card to someone with KTQx would be bad.