There's an email from Christina (his daughter) on classiccmp cctalk, so I'd be inclined to believe it.
(edited to add that Christina is his daughter, and if you can find a cctalk archive, or subscribe and just missed it, its dated 6:31 and AEK forwarded it onto the list this morning.)
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Can we get independent verification of this? I've looked at all of my usual primary sources and I can't find third party confirmation.
There's an email from Christina (his daughter) on classiccmp cctalk, so I'd be inclined to believe it.
(edited to add that Christina is his daughter, and if you can find a cctalk archive, or subscribe and just missed it, its dated 6:31 and AEK forwarded it onto the list this morning.)
The Wikipedia page (http://en.wikipedia.org/wiki/Douglas_Engelbart) has already been updated with this link:
http://gigaom.com/2013/07/03/doug-engelbart-american-invento...
I can't find anything either though at 88, it isn't too hard to believe.
There's this: https://twitter.com/hrheingold/status/352489027716386816
but I do not know how Rheingold get the news