Story highlights No foul play is suspected, sheriff's office says

Woman's husband, Purdue professor Ei-ichi Negishi, has been hospitalized

(CNN) A Nobel Prize-winning professor's wife said to be suffering from Parkinson's disease was found dead at an Illinois landfill Tuesday afternoon, authorities said.

The body of Sumire Negishi, 80, and a vehicle belonging to her and her husband were spotted at the landfill just south of Rockford, the Ogle County Sheriff's Office said.

Her husband, Purdue University chemistry professor Ei-ichi Negishi, 82, was found walking nearby, and he has been hospitalized.

The couple from West Lafayette, Indiana, had been reported missing, along with their car, to Indiana State Police on Monday night, according to the sheriff's office.

The case is under investigation, the sheriff's office said, but no foul play is suspected.

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