[Closed] overpair vs set

Hand converted with online PokerStrategy.com hand converter:

Play hand

$0.01/$0.02 No-Limit Hold'em (6 handed)

Known players:
[tg]MP3 (Hero)$2.27:///////;CO$2.39:///////;BU$3.67:///////;SB$2.82:///////;BB$2.00:///////;MP2$5.05:///////;[/tg]

Preflop: Hero is MP3 with A:d, A:c.
MP2 folds, Hero raises to $0.07, CO raises to $0.16, 3 folds, Hero raises to $0.40, CO calls $0.24.

Flop: ($0.83) 6:c, 8:s, J:d (2 players)
Hero bets $0.40, CO raises to $0.80, Hero calls $0.40.

Turn: ($2.43) T:c (2 players)
Hero checks, CO bets $1.19(All-In), Hero calls $1.07.

River: ($4.69) 9:h (2 players)

Final Pot: $4.69.
Results follow:

Hero shows a pair of aces(A:d A:c).
CO shows three of a kind, jacks(J:h J:s).

CO wins with three of a kind, jacks(J:h J:s).

I didn't know much about CO at the time but he seemed to be fairly tight (VPIP / PFR 16 /16).