Having read Steve Kulls full account of the Georgia bigfoot hoax, i made my way to the bigfoottracker.com website, the home of the two hoaxers in question. I noticed that all images of Matthew Whitten have been removed.
On the website it says
"BIGFOOT TRACKER IS HEADING IN
A NEW DIRECTION WITH RICK DYER
AND MIKE MOSTELLER"
although no mention is made of Whittens absense.
I guess that Whitten felt that they had milked their 15 minutes of fame and decided to rejoin the real world.