Tucson, Ariz ? Lute Olson’s doctor said Tuesday that the former Arizona basketball coach had a stroke within the last year and he advised him to retire.

The comments by Dr. Steven Knope at a news conference called by Olson’s family offer the first explanation for Olson’s sudden retirement last week, two days after he appeared at the Wildcats’ media day. Olson said at the time he was energized and looking forward to his 25th season with Arizona.

Knope said an MRI confirmed the stroke in the frontal part of Olson’s brain, which left the Hall of Famer with severe depression and impaired judgment.

“This is a rather cruel twist of fate,” Knope said at a McKale Center news conference attended by two of Olson’s daughters, Jodi Brase and Christi Snyder.

“He is quite literally devastated,” Knope said. “He was doing great over the summer and very much wanted to fulfill his obligation to the community and the university.”

Knope said Olson is resting at home and is on a blood thinner, and he’s optimistic Olson will recover.

The announcement ended almost a year of speculation about Olson’s health. Rumors began to circulate when he took a leave of absence last season for what he later termed a “medical condition that was not life-threatening.”

Over the last few weeks, Knope said he had talked to Olson about retiring because Olson was struggling to handle his workload as preseason practice opened.