Wow. Complete story finally comes out. Unreal amounts of money involved. NBA certainly has their issues. No way he was just a rogue ref. Stern covered the rest up.
http://www.espn.com/nba/story/_/id/25980368/how-former-ref-tim-donaghy-conspired-fix-nba-games
http://www.espn.com/nba/story/_/id/25980368/how-former-ref-tim-donaghy-conspired-fix-nba-games