Larry Brown is leaving SMU after turning down a contract extension, ending a four-year run during which the Mustangs made the NCAA Tournament for the first time since 1993 and then were banned from postseason play last season.

SMU athletic director Rick Hart said Friday that Brown, who was signed through next season, had been offered a new deal through 2020.

“This morning, however, I was notified by his agent that he would be stepping down,” Hart said. “Coach Brown was able to accomplish so much in his four years on the Hilltop, including leading us to our first conference title since 1993. He has left his mark on SMU basketball, and we are thankful for what he’s done.”

Brown didn’t return messages left on his cell phone by The Associated Press.

The Hall of Fame coach had repeatedly said how much he loved what he was accomplishing at SMU. Brown, who turns 76 in September, had indicated late last season that he wanted to keep coaching as long as SMU would have him.

Brown told the Dallas Morning News he had been discussing an extension with SMU officials for the past 20 months, but they were unable to agree on terms. The coach didn’t get into specifics of what he wanted and what was offered by the school.

The coach also expressed regret at the timing of the news, which became public in the aftermath of five police officers being shot to death Thursday night in downtown Dallas, only a few miles from the SMU campus. Seven other officers and two civilians were wounded in the attack.

Associate head coach Tim Jankovich will take over as head coach, as had been expected since he came to SMU with Brown in 2012 after serving five seasons at Illinois State.