100NL PS, Set of K's, Confusing River

I have to call this don't I? Would someone really risk a flush getting checked down by check raising here? So confused.

PokerStars Game #3429222944: Hold'em No Limit ($0.50/$1.00) - 2005/12/25 - 01:59:59 (ET)
Table 'Hapag' Seat #2 is the button
Seat 1: Pryderi ($175.35 in chips)
Seat 2: KitWalker350 ($52.90 in chips)
Seat 3: Pedro_chips ($16.45 in chips)
Seat 4: bowlerboy300 ($162.65 in chips)
Seat 5: ndk1 ($35.10 in chips)
Seat 6: WildBob182 ($107.80 in chips)
Pedro_chips: posts small blind $0.50
bowlerboy300: posts big blind $1
*** HOLE CARDS ***
Dealt to WildBob182 [Kd Kc]
ndk1: folds
WildBob182: raises $2 to $3
Pryderi: folds
KitWalker350: folds
Pedro_chips: folds
bowlerboy300: calls $2
*** FLOP *** [6d Ks Tc]
bowlerboy300: checks
WildBob182: bets $3.50
bowlerboy300: calls $3.50
*** TURN *** [6d Ks Tc] [7d]
bowlerboy300: checks
WildBob182: bets $8
bowlerboy300: calls $8
*** RIVER *** [6d Ks Tc 7d] [Qd]
bowlerboy300: checks
WildBob182: bets $15
bowlerboy300: raises $50 to $65
WildBob182: ???