Japan Nobel winner Ei-ichi Negishi's wife found dead in US

Police in the US are examining the passing of the spouse of a Japanese Nobel Prize-winning scientific expert in Illinois. 

The couple had been accounted for missing from their home in the state on Monday. 

Ei-ichi Negishi was found by police meandering along a street close Rockford at an opportune time Tuesday morning and was taken to doctor's facility. 

The assemblage of 80-year-old Sumire Negishi was found alongside the couple's auto at a landfill site soon after. 

Police have said they don't speculate treachery. 

The couple had last been seen at their West Lafayette home, close Purdue University where Mr Negishi is a science teacher. 

The Negishi family told nearby news channel WTHR that they trusted the couple had been endeavoring to discover their way to the air terminal and got "confused" en route. 

The Orchard Hills Landfill, where she was found, is around 8 miles (12km) from Chicago Rockford International Airport. 

The family said Mrs Negishi had been "close to the finish of her fight with Parkinson's [disease]". 

Mr Negishi, a Japanese national who lived in the US, was granted the Nobel Prize for science in 2010.