TOKYO - Japan's ambassador-designate to China, Shinichi Nishimiya, died on Sunday in a Tokyo hospital, the Foreign Ministry said, three days after he was found unconscious on a Tokyo street.

Doctors were looking into the cause of death, ministry official Takashi Ariyoshi said in a statement, but no other details were available. Nishimiya, 60, was found unconscious on a street near his home on his way to work.

Nishimiya was to have left in mid-October to take over from Uichiro Niwa as Japan's top envoy in Beijing.

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