NL100 PF BB KQs, river decision

Poker Stars, $0.50/$1 No Limit Hold'em Cash, 6 Players

SB: $100.50 (100.5 bb)
Hero (BB): $100 (100 bb)
UTG: $100 (100 bb)
MP: $132.89 (132.9 bb)
CO: $241.08 (241.1 bb)
BTN: $91.79 (91.8 bb)

Preflop: Hero is BB with Q♣ K♣
2 folds, CO raises to $3, 2 folds, Hero calls $2

Flop: ($6.50) 7♣ K♦ 6♥ (2 players)
Hero checks, CO bets $4.34, Hero calls $4.34

Turn: ($15.18) 2♦ (2 players)
Hero checks, CO bets $10.15, Hero calls $10.15

River: ($35.48) 7♦ (2 players)
Hero checks, CO bets $28, Hero ???

Villain 23/18/9 (1.7k hands)

OR CO 26%
F cbet 50%
T cbet 72%(29)

WWSF 47%
AGG % 34%

What do you think about river ? call/fold ? what is our best bluffcathers ?

thanks !!!