PokerStars - $0.02 NL FAST - Holdem - 9 players
Hand converted by PokerTracker 4

Hero (BTN): 168.5 BB
SB: 109.5 BB (VPIP: 25.44, PFR: 19.05, 3Bet Preflop: 6.67, Hands: 171)
BB: 88.5 BB (VPIP: 15.00, PFR: 15.00, 3Bet Preflop: 0.00, Hands: 21)
UTG: 231.5 BB (VPIP: 14.94, PFR: 11.88, 3Bet Preflop: 2.44, Hands: 264)
UTG+1: 121.5 BB
UTG+2: 131 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 1)
MP: 70 BB (VPIP: 16.67, PFR: 16.67, 3Bet Preflop: 0.00, Hands: 6)
MP+1: 273.5 BB (VPIP: 8.82, PFR: 5.88, 3Bet Preflop: 0.00, Hands: 34)
CO: 63 BB (VPIP: 23.76, PFR: 10.50, 3Bet Preflop: 0.00, Hands: 186)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has 9 9

fold, UTG+1 raises to 3 BB, fold, fold, fold, CO calls 3 BB, Hero calls 3 BB, SB calls 2.5 BB, fold

Flop: (13 BB, 4 players) K 9 5
SB checks, UTG+1 checks, CO checks, Hero bets 6 BB, fold, fold, CO calls 6 BB

Turn: (25 BB, 2 players) 6
CO checks, Hero bets 12 BB, CO calls 12 BB

River: (49 BB, 2 players) J
CO bets 42 BB and is all-in, Hero ???

Is this callable or just fold?
Thank you.