Set vs LAG - 3-bet river when scare card hits?

[Lunkan]

MP1 is very LAG. Only played about 20 hands with him but he has seen half of the flops and raised 20% of his hands preflop. A couple of hands ago the board read A 8 2 2 and he 3-bet with 8 3.

Poker Room skin
Limit Holdem Ring game
Limit: $1/$2
10 players
Converter

Pre-flop: (10 players) Hero is UTG+1 with J[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/diamond.gif[/img]
UTG folds, <font color="#cc0000">Hero raises</font>, UTG+2 folds, MP1 calls, 6 folds.

Flop: T[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/club.gif[/img] (5.5SB, 2 players)
<font color="#cc0000">Hero bets</font>, MP1 calls.

Turn: 8[img]/images/graemlins/heart.gif[/img] (3.75BB, 2 players)
<font color="#cc0000">Hero bets</font>, <font color="#cc0000">MP1 raises</font>, <font color="#cc0000">Hero 3-bets</font>, MP1 calls.

River: A[img]/images/graemlins/club.gif[/img] (9.75BB, 2 players)
<font color="#cc0000">Hero bets</font>, <font color="#cc0000">MP1 raises</font>, Hero ?

Considering he is somewhat a maniac and that he probably would have raised the flop if he had a flush draw do you 3-bet here?