Surely he has toget away from his set of kings here? I hope so much I inspired a river rat thread somewhere.

PokerStars No-Limit Hold'em, $0.02 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($1.85)
UTG ($8.69)
MP ($4.95)
CO ($4.53)
Button ($0.94)
Hero ($4.98)

Preflop: Hero is SB with J, 7.
1 fold, MP calls $0.02, CO raises to $0.08, 1 fold, Hero raises to $0.22, 1 fold, MP folds, CO raises to $0.48, Hero calls $0.26.

Flop: ($1) 5, K, 4 (2 players)
Hero checks, CO bets $0.1, Hero calls $0.10.

Turn: ($1.20) 6 (2 players)
Hero checks, CO bets $0.84, Hero raises to $4.4, CO calls $3.11 (All-In).

River: ($9.55) 8 (2 players, 1 all-in)

Final Pot: $9.55

Results in white below:
Hero has Jc 7c (straight, eight high).
CO has Kh Kd (three of a kind, kings).
Outcome: Hero wins $9.54.