According to a post on the dubiously reliable TMZ.com, Ike Turner has passed away.
Working on getting confirmation or denial ASAP from management. Turner had pulled out of a headlining performance at the Big Muddy Blues Festival this past September due to illness.
[Update, 3:48 p.m.]: I just called Maximus Entertainment, and the woman I spoke to there said it's true, although they had no comment at this time. A statement is planned to be released by the company soon; I'll post it as soon as I have it.]