Rivered straight on 4-straight, paired board

[baudib1]

Villain is a weird player...don't know how he got his bigstack, he's running 35/20 after about 25 hands.

Two previous hands against him: Flat-called BB when I raised from SB with KQo, flatted cbet on JTx flop, bet small when KD came on turn (brought 3 to flush), we both checked an Ad river (4 flush to board); I won and he had KK.
Other hand, I raised with 55, he flat-called, board came TT9, I bet, he calls, we check on turn Q, I river 5 for boat, bet, he minraises, I shove, he folds.

What do I do here? Should I bet or fold turn?

poker stars, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
Hand History Converter by Stoxpoker

UTG: $35.10 (70.2 bb)
MP: $15.40 (30.8 bb)
Hero (CO): $99.35 (198.7 bb)
BTN: $201.70 (403.4 bb)
SB: $12.50 (25 bb)
BB: $52.05 (104.1 bb)

Pre-Flop: Hero is CO with 5

A

2 folds, Hero raises to $1.50, BTN calls $1.50, 2 folds

Flop: ($3.75) 6

4

7

(2 players)
Hero bets $2, BTN calls $2

Turn: ($7.75) 7

(2 players)
Hero checks, BTN bets $4, Hero calls $4

River: ($15.75) 3

(2 players)
Hero checks, BTN bets $10, Hero???

 

[F Paulsson]

I'm big on double-barreling strong draws, but I wouldn't here, because the turn didn't change anything. He's not folding better.

I think a case for betting the river could be made versus many (or even most) villains, but I don't know if this particular opponent is one of them. If you're looking to bet the river, villain has to be somewhat passive. You could potentially bet/call the river, if villain is overly bluffy. Some are passive enough that you could even bet/fold.

But the safe route - and versus someone that you have so few hands on as to be virtually an unknown - is to check/call the river.