Yomiuri shimbun just revealed today that he died of cancer in March 28, at 71.
This is the announcement, from his website:
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Damn. This is big. RIP.
Damn, throat cancer. What an icon.
RIP Sakamoto. Be sure to listen to some YMO, today.
RIP 
God died today.
Rest in peace, king…
Fuck. Rest in peace, king.
Goodbye legend. You will live forever through the legendary musical pieces you’ve composed. Huge loss.
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one of the best to ever do it
R.I.P. Not a good year for YMO ;;