What do we put him on with that river bet

[senorquinn]

I am new to the table with not much for reads on villain. What is the story he is telling with that overbet on the river?

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.10/$0.15
4 players
Converter

Pre-flop: (4 players) HERO is BB with J[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/heart.gif[/img]
2 folds, SB calls, HERO checks.

Flop: 9[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/club.gif[/img] ($0.3, 2 players)
SB checks, <font color="#cc0000">HERO bets $0.15</font>, SB calls.

Turn: 4[img]/images/graemlins/heart.gif[/img] ($0.6, 2 players)
SB checks, <font color="#cc0000">HERO bets $0.4</font>, SB calls.

River: J[img]/images/graemlins/club.gif[/img] ($1.4, 2 players)
<font color="#cc0000">SB bets $3</font>