What happened to Sen. Paul Simon?

He died after complications from heart surgery, but what was the heart surgery for. He had bypass surgery only in 1999, and this seems like a very short time for him to have gotten clogged up again. Was it something else this time?

From http://www.chicagotribune.com/news/local/chi-031209simonobit,0,1115255.story?coll=chi-newsbreaking-hed

I dunno. One minute I’m listening to him sing about bein’ a dad, and next thing I hear he’s dead. Sheesh. How’s Art holding up, I wonder.
(That isn’t funny, is it?) :wink: