Coldcalls all around -- how to play this TPTK w/ AK?

[Paradigm]

Full Tilt 1/2. Never really experienced anybody cold call three bets TWICE. My concern is the river play.

Seat 1: andy7272 ($44)
Seat 2: YohanN7 ($69.25)
Seat 3: HERO ($26.25)
Seat 4: dakingwalk ($45.25)
Seat 5: Ace McCrakin ($14.25)
Seat 6: RedWingBaby ($34.25)
Seat 7: gerflip ($15.50)
Seat 8: Dave310420 ($50.25)
Seat 9: rhinoceraces ($49)
Ace McCrakin posts the small blind of $0.50
RedWingBaby posts the big blind of $1
The button is in seat #4
*** HOLE CARDS ***
Dealt to HERO [As Kh]
gerflip folds
Dave310420 folds
rhinoceraces calls $1
andy7272 calls $1
YohanN7 raises to $2
HERO raises to $3
dakingwalk calls $3
Ace McCrakin folds
RedWingBaby folds
rhinoceraces calls $2
andy7272 folds
YohanN7 calls $1
*** FLOP *** [6c Kd 9d]
rhinoceraces bets $1
YohanN7 raises to $2
HERO raises to $3
dakingwalk calls $3
rhinoceraces calls $2
YohanN7 calls $1
*** TURN *** [6c Kd 9d] [8h]
rhinoceraces checks
YohanN7 checks
HERO bets $2
dakingwalk has 15 seconds left to act
dakingwalk calls $2
rhinoceraces calls $2
YohanN7 calls $2
*** RIVER *** [6c Kd 9d 8h] [5c]
rhinoceraces checks
YohanN7 checks
HERO checks
dakingwalk bets $2
rhinoceraces folds
YohanN7 calls $2
HERO calls $2