NL4, AKs TPTK

IPoker, $0.02/$0.04 No Limit Hold'em Cash, 5 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

BTN: $4 (100 bb)
Hero (SB): $5.58 (139.5 bb)
BB: $8.81 (220.3 bb)
MP: $4.43 (110.7 bb)
CO: $4.25 (106.3 bb)

Preflop: Hero is SB with A K
MP folds, CO calls $0.04, BTN folds, Hero raises to $0.20, BB folds, CO calls $0.16

Flop: ($0.44) T A 7 (2 players)
Hero bets $0.80, CO calls $0.80

Turn: ($2.04) 6 (2 players)
Hero bets $1.32, CO calls $1.32

River: ($4.68) 5 (2 players)
Hero checks, CO checks

Results: $4.68 pot ($0.31 rake)
Final Board: T A 7 6 5
Hero mucked A K and won $4.37 ($2.05 net)
CO showed T 4 and lost (-$2.32 net)

Opponent's stats: VP/PFR/AF/WTS/hands 66/5/2.0/38/41

Just one question:

River = ch/f or pAI? I really cannot decide.