CO is unknown. Doesn't have full stack, so might be a weaker player.
OTR only bluffs that CO can have are QTs/T8s and IMO he is never betting worse OTR. So I think it's a fold without any info about him.
Poker Stars $0.10/$0.25 No Limit Hold'em - 6 players - View hand 2611479
DeucesCracked Poker Videos Hand History Converter
Hero (BTN): $26.23
SB: $24.50
BB: $37.53
UTG: $47.29
MP: $25.10
CO: $24.30
Pre Flop: ($0.35) Hero is BTN with K 
K 
2 folds, CO raises to $0.75, Hero raises to $2.25, 2 folds, CO calls $1.50
Flop: ($4.85) 5 
J 9 (2 players)
CO checks, Hero bets $2.38, CO calls $2.38
Turn: ($9.61) 6 (2 players)
CO checks, Hero bets $5.70, CO calls $5.70
River: ($21.01) A (2 players)
CO bets $10.03, Hero ???
