Joakim Noah and Jimmy Butler were initially very close friends as Chicago Bulls' teammates, but it became tumultuous during the 15-16 season.

According to multiple sources, Noah and Butler engaged in several heated disagreements throughout that season.

"What happened?" Butler says. "I don't know. All I can say is, obviously he's been with me since I was a nobody in this league. And I went about things a lot differently. My voice wasn't heard. And he's been with me as I came to be an All-Star as well in this league. And my voice was heard then. And when my voice is heard, I'm going to let it be heard."

"We're just different people," Noah says. "We were always very close; me and Jimmy were always very close, but things change."

"It was hard because we all came in together," Taj Gibson says. "We were the core, and it's rough when your core starts breaking up."

Noah left the Bulls to sign with the New York Knicks in 2016.