Having lived the life of a rock group player for 7 years 1967-1973, I'd say that list, and its excellent presentation, is pretty sobering.

I did not see these two very important musicians there:

Great American blues guitarist Mike Bloomfield, drug overdose, 1981.  Bloomfield played behind Bob Dylan in some concerts and recorded with Dylan on some albums.  He was on 'Like a Rolling Stone', others at that time, and also recorded and performed with the Electric Flag.  His performace on EF's 'A Long Time Comin' is exemplary.

Felix Papparlardi, bassist and cellist, produced Cream's Disraeli Gears, co-wrote some of the tunes along with girlfriend Gail Collins, and played on several Cream 'Wheels of Fire' tracks.  After his association with Cream ended, he went on to play bass for Mountain, who performed at Woodstock in 1969. His life ended tragically in April 1983 when, during a domestic argument in New York City, Collins shot and killed him.  Collins, who by then was his wife, claimed it was accidental.  She was later aquitted of murder but found guilty of criminally negligent homicide and sentenced to a maximum of four years in jail.

Sources for the above:
Bloomfield, general knowledge.

Pappalardi, culled from a 1983 article in a ewsmagazine, Time or Newsweek or US News, I forget which.

The list is also rock-pop centric and thereby omits the great, great, classical pianist Glenn Gould, who died on Sept 25, 1982, age 50, from a stroke.  Gould was a hypocondriac and a Rx pill popper, that may have contributed to his untimely demise.

By then, Gould had recorded, on piano, along with a huge amount of other stuff, every single piece of Bach's compositions for harpsichord.

Gould died on Oct 04, 1982, not Sept 25 as I originally said.

Gould's genius was not only reflected in his recordings, but, according to biographer Friedrich, Otto (1989) in 'Glenn Gould: A Life and Variations': 

Gould had the ability to look through a piece of music for the first time, then go over to the piano without the music and play it perfectly. 

Friedrich also said that Gould could do this:  I'm paraphrasing:

"Play a Beethoven sonata that was not written by Beethoven."
"Play a fugue that was not written by Bach."

In other words, Gould could improvise in the style of different great composers.  Unfortunately, no recordings were ever made of this.

Gould was able to store huge amounts of music in his head and
just play it spontaneously.  He preferred Bach over other composers.   His piano technique, at least when playing Bach, was kind of harpsichord-like and true to what would have been accepted performance parameters of Bach's time. 

There is an American Masters documentary about Gould, it has been shown only once on PBS, this past summer.   An interesting comment in this doc was "Gould just doesn't know what making a playing mistake is about.  Everything he plays is perfect."

Gould was Canadian.   There is a statue of him in outside the Glenn Gould studios in downtown Toronto.