Former longtime Dallas Mavericks general manager Donnie Nelson sued the team Thursday, alleging that owner Mark Cuban fired him last summer as retaliation for reporting that Cuban’s chief of staff sexually harassed and sexually assaulted his nephew during a job interview in 2020. The lawsuit also alleges that Cuban offered Nelson, who was fired in June, $52 million to withdraw a wrongful termination claim and sign a confidentiality statement related to the alleged harassment and abuse of his nephew.