PL 25 - KK with A on the flop. River decission??

[Maksim]

Can you please say me your action on the river?

Poker Room skin
Pot Limit Holdem Ring game
Blinds: $0.25/$0.25
8 players
Converter

Stack sizes:
UTG: $24.25
UTG+1: $24.25
MP1: $21.60
MP2: $42.15
CO: $3.00
Hero: $46.50
SB: $38.75
BB: $25.90

Pre-flop: (8 players) Hero is Button with K[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/spade.gif[/img]
5 folds, <font color="#cc0000">Hero raises to $1</font>, SB folds, BB calls.

Flop: 2[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/heart.gif[/img] ($2.25, 2 players)
<font color="#cc0000">BB bets $1.5</font>, <font color="#cc0000">Hero raises to $3</font>, BB calls.

Turn: 8[img]/images/graemlins/club.gif[/img] ($8.25, 2 players)
BB checks, Hero checks.

River: 3[img]/images/graemlins/spade.gif[/img] ($8.25, 2 players)
BB checks, Hero ???