Rick Carlisle stepped down as the head coach of the Dallas Mavericks on Thursday afternoon.

“Rick informed me today about his decision to step down as head coach,” Mark Cuban said in a statement. “On top of being a tremendous basketball coach, he was also a friend and a confidant. Rick helped us bring the O’Brien Trophy to Dallas, and those are memories I will always cherish… We wish him all the best.”

Carlisle ended a 13-year tenure with the organization. Now, he becomes the latest domino to fall since The Athletic’s scathing report on the instability in Dallas’ front office. In weeks leading up to Carlisle stepping down, his name was rumored to be floating amongst coaching position candidates. He instantly becomes one of the most coveted coaches on the open market.

“This was solely my decision,” Carlisle said in a statement to ESPN’s Adrian Wojnarowski. “My family and I have had an amazing 13-year experience working with great people in a great city… Dallas will always be home, but I am excited about the next chapter of my coaching career.”

One of the suspected reasons for Carlisle’s sudden resignation is the reported tension between star player Luka Doncic and the former coach. The two often didn’t see eye-to-eye on the court, and it is widely reported that Doncic wasn’t a fan of Carlisle’s propensity to call offensive sets. Doncic is aiming for a more free-flowing style of play.

Carlisle is the winningest coach in franchise history. He led the Mavericks to nine playoff appearances in his 13 seasons. And he was instrumental in the franchise’s lone championship in 2011.

The resignation came as a surprise because, in the days following the Mavericks’ loss to the Los Angeles Clippers, Cuban was adamant about his continued belief in Carlisle.

“Let me tell you how I look at coaching,” Cuban said. “You don’t make a change to make a change. Unless you have someone that you know is much better, the grass is rarely greener on the other side.”

With both Carlisle and Donnie Nelson out, the attention turns to who the Mavs will hire to replace the two organizational pillars.

Step one for the organization is finding a general manager. Step two is finding a coach that fits Doncic’s playstyle. One candidate that Doncic reportedly is a strong fan of is Mavericks assistant coach Jamahl Mosley. The stand-in coach that helped lead Dallas to a win over the New York Knicks.

“He’s got the things that are needed for a head coach,” Doncic said after Mosley’s one-game stand-in. “He can be a head coach for sure.”

In the coming weeks, Dallas will search the coaching carousel for candidates, and finding the right one can define the next few seasons for a team eager at contention.

Related Mavericks reading:

“Donnie Nelson out as Dallas Mavericks general manager.”

Feature image via Kevin Jairaj-USA TODAY Sports