200NL: Donk keeps minraising me weirdly

[Clashes]

Ultimate Bet No-Limit Hold'em, $2 BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($247.75)
UTG ($208.10)
Button ($164.35)
SB ($204.25)

Preflop: Hero is BB with 3[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, SB completes, <font color="#CC3333">Hero raises to $8</font>, <font color="#CC3333">SB raises to $15</font>, Hero calls $7.

Flop: ($30) A[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

Turn: ($30) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $20</font>, SB calls $20.

River: ($70) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $45</font>, <font color="#CC3333">SB raises to $90</font>...

Villain is a big donk, he posted the BB UTG when he first sat down and has been playing a lot of hands. He is pretty erratic in general, but I dont have stats on him ATM. Something like 50/10/1 works I tihnk.

[HoldEmNewby]

i like a river call, it could be a bluff into weakness.

[Jamougha]

He has jacks but I call anyway.

[KingGordy]

Call, take a note.

[Clashes]

thanks for the replies, I figured for ~4-1 I have to be good here at least that much. Villain shows AQ. Any thoughts on river bet size?

[JackAll]

lol ... my river bet size is $0