This guy was almost a maniac. I put him on Ax or straight draw. What is the correct move?

Full Tilt No-Limit Hold'em, $0.02 BB (8 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

UTG+1 ($1.97)
MP1 ($2.78)
Hero (MP2) ($2.04)
CO ($3.83)
Button ($0.77)
SB ($2)
BB ($9.09)
UTG ($2)

Preflop: Hero is MP2 with K, A
3 folds, Hero bets $0.08, 1 fold, Button calls $0.08, 1 fold, BB raises to $0.14, Hero raises to $0.50, 1 fold, BB calls $0.36

Flop: ($1.09) 2, A, 9 (2 players)
BB bets $0.50, Hero calls $0.50

Turn: ($2.09) J (2 players)
BB bets $8.09 (All-In), Hero calls $1.04 (All-In)

River: ($4.17) Q (2 players, 2 all-in)

Total pot: $4.17 | Rake: $0.27