[doodliego]

The NBA and the disgraced ref maintained that he bet on his own games, but did not fix outcomes.

The ESPN article argues otherwise through statistical analysis of foul calls as well as investigative reporting with the other gamblers and bookies in Donegha's circle of corruption. Based on their statements, it's rather conclusive that he skillfully manipulated games, although he couldn't control every outcome.

The article also highlights an unfortunate situation where Donaghy told the FBI about other crooked refs, but the FBI briefed NBA commissioner David Stern about their investigation early on, while it was still ongoing.

The investigation was then leaked to the press (strongly implying Stern did it). This made it impossible for Donaghy to wear a wire since he was now disgraced and fired from his job, and the NBA maintained that Donaghy's was an isolated incident of one rogue ref placing bets but not affecting games.

That's my summary of their reporting anyway. I found it persuasive.