Killing himself at 75 is crazy.
I actually just saw a Soul Train special on VH1 a couple weeks ago. He kept that show alive for decades and gracefully left when he knew he wasn't keeping up with new music as well as someone younger could.
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http://28.media.tumblr.com/tumblr_lcb35gGx0t1qailr4o1_500.gif
http://www.megavideo.com/?v=57N0YAEJ