Former NBA player Roger Mason Jr. is firing back after being terminated as commissioner of the BIG3 basketball league.

On Monday (Mar. 12), the BIG3 announced that it was shaking things up in the front office after firing Mason Jr. because of “shady activity.” The league sent out a letter to players, coaches, and other personnel detailing an investigation involving Mason Jr. and two Qatari business investors who allegedly stiffed the league out of millions.

Mason Jr. denied the allegations in a statement released to ABM saying,

“I was terminated by BIG3 in retaliation for legal claims which I made last week in a letter sent by my attorneys to BIG3 Basketball alleging that the League had breached my employment agreement.”

Mason Jr. says the violations of his agreement centers around BIG3 co-founder Jeff Kwatinetz, who he claims has been “engaged in a malicious, defamatory campaign” of disparaging him in an attempt to prevent him from the performance of contractual duties and responsibilities.

Ice Cube will oversee the league he founded with Kwatinetz, an entertainment executive, as it enters its second season. The BIG3, which features eight teams that consist mainly of retired NBA players, has attracted former stars such as Amare Stoudemire, Metta World Peace and Baron Davis in Year 2, it announced Monday as part of its scheduled release.

The Big 3 League season two begins on June 22nd and concludes with their league championship game on August 24th at Barclays Center in Brooklyn, New York.