Doug Collins was fined $15,000 for verbal abuse of an official during Saturday's overtime win against the Pacers.
Referee Zach Zarba was on the receiving end of Collins' anger.
"I don't ever want to get fined. I've been in the NBA for 40 years," Collins said. "It was sort of a buildup over a few things. It wasn't one thing, it was sort of a buildup. It was an emotional game, and we were able to win the game and stuff. I didn't leave the court in a timely fashion, and I should have been fined. The league did what they should have done, and I apologized."