I put him on pocket pair, if there was 4th diamond, i would fold without doubt...
What you think about checking behind on river?
Hand converted with online PokerStrategy.com hand converter:
$0.02/$0.05 No-Limit Hold'em (6 handed)
Known players:
[tg]MP3$9.47:///////;CO$5.55:///////;BU$9.48:///////;SB$5.37:///////;BB(Hero)$5.00:///////;MP2$10.77:///////;[/tg]
Preflop: Hero is BB with A:s, J:s.
2 folds, CO raises to $0.2, BU folds, SB calls $0.18, Hero calls $0.15.
Flop: ($0.60) 5:d, J:d, 4:d (3 players)
, SB checks, Hero bets $0.35, CO calls $0.35, SB calls $0.35.
Turn: ($1.65) Q:h (3 players)
, SB checks, Hero bets $0.35, CO folds, SB calls $0.35.
River: ($2.35) 8:h (2 players)
, SB checks, Hero checks.
Final Pot: $2.35.