I'm very sad to hear of this, he was one cool cat. I had the distinct pleasure and honor of playing drums for him on a gig in 1990. Back then I remember thinking he was pretty old but he absolutely brought the house down, playing pretty much non-stop for close to 2 hours! It was one of the real true highlights of my playing career and one that I'll certainly never forget.
RIP, Bo Diddley... they're all doing that Bo Diddley beat in heaven now!