BB is an unknown.

BTN: 123.5 BB
Hero (SB): 249 BB
BB: 136.5 BB
UTG: 295 BB
MP: 115.5 BB
CO: 148 BB

Hero posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has Ac Js
fold, fold, fold, BTN raises to 3 BB, Hero raises to 10 BB, BB calls 9 BB, fold

Flop : (23 BB, 2 players) Tc Kd As
Hero checks, BB bets 9 BB, Hero calls 9 BB

Turn : (41 BB, 2 players) Td
Hero checks, BB bets 31 BB, Hero calls 31 BB

River : (103 BB, 2 players) 9s
Hero checks, BB bets 86.5 BB and is all-in

Thoughts? What range are we giving him pre that takes this line?