Mac Irvin, an influential summer hoops figure in the Chicago area, died on Saturday.

The exact cause of death was not immediately known, but Irvin had been fighting diabetes.

Duke assistant Jeff Capel was among the first to Tweet about Irvin's death.

"RIP to Mr. Mac Irvin," Capel Tweeted. "A mentor to so many. You will be missed!"

Countless elite prospects have spent summers playing for the Mac Irvin Fire. The most recent 17-and-under team featured Jabari Parker, a 6-foot-8 forward who is regarded as the nation's No. 1 prospect in the Class of 2013.