Texas Tech men’s basketball coach Billy Gillispie has resigned because of health reasons, the school announced Thursday. Gillispie’s departure comes less than a month after Texas Tech said it was looking into allegations of player mistreatment by the veteran coach and that it had reported practice-time violations to the NCAA. Athletic director Kirby Hocutt already had told Gillispie he no longer could handle day-to-day decisions about the program so he could focus on his health. Hocutt put associate head coach Chris Walker in charge. Gillispie spent six days in a Lubbock, Texas, hospital, and doctors later ordered him to avoid stress for 30 days. He also received treatment at the Mayo Clinic in Minnesota earlier this month for kidney problems and abnormal headaches.