Arizona Wildcats assistant  coach Book Richardson has left the team for health reasons, UA said tonight.

UA offered no specifics on how long Richardson will be out nor if he would be replaced, at least temporarily.

“This is not a life or death situation, but nonetheless very important," Richardson said in a statement. "I am very appreciative to be given the flexibility to temporarily step away from coaching and basketball, and to concentrate on my well-being. I want to thank coach (Sean) Miller, the Arizona basketball family and the athletic department for allowing me this opportunity. I look forward to returning to the Arizona basketball program.”

Miller said in the UA statement that he supported Richardson's decision.

"What’s most important at this time is that he takes care of himself," Miller said. "We will miss his contribution to our program, but giving him time away is the best thing we can do to help. We look forward to his return.”

Richardson, 40, has worked under Miller for the past six seasons, including two at Xavier before Miller took over the Wildcats' program. Richardson is known as a key recruiter, and his loss is likely to be felt this fall, when top recruiting targets often meet with coaches at their homes and on campus.