Villain is unknown. 2nd hand at table.

PokerStars - $0.50 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4

Hero (SB): $50.00
BB: $45.80
UTG: $50.00
CO: $50.00
BTN: $71.44

Hero posts SB $0.25, BB posts BB $0.50

Pre Flop: (pot: $0.75) Hero has K J

fold, fold, fold, Hero raises to $1.50, BB raises to $2.50, Hero raises to $6.50, BB calls $4.00

Flop: ($13.00, 2 players) A 3 T
Hero bets $4.75, BB calls $4.75

Turn: ($22.50, 2 players) K
Hero checks, BB bets $8.00, Hero calls $8.00

River: ($38.50, 2 players) A
Hero checks, BB bets $26.55 and is all-in, Hero ???