UPDATE: Cause of death released for Indiana woman found dead at Ogle County landfill

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Updated: March 29, 2018 1:30 p.m.

DAVIS JUNCTION, Ill. (WIFR) -- The Ogle County Coroner releases a cause of death for the West Lafayette, IN woman found dead in her car near the Orchard Hills Landfill.

The Ogle County Sheriff's Office says the death of 80-year-old Sumire Negishi was not foul play. The coroner ruled her death an accident caused by exposure and hypothermia.

The family of Sumire and her husband, 82-year-old Ei-Ichi Negishi say the couple was travelling to Rockford. They were reported missing on March 12, 2018 from West Lafayette.

Ei-ichi Negishi, a professor at Purdue University and a Nobel Prize winner, was found walking near the 8200 block of North Route 251 in Davis Junction.

The family says Sumire was near the end of a battle with Parkinson's Disease.

DAVIS JUNCTION, Ill. (WIFR) -- A West Lafayette, Indiana woman reported missing on Monday evening has been found dead.

At 5 a.m. Tuesday, Ogle County Sheriff’s Deputies went to the 8200 block of N. Route 251 in Davis Junction to check on an elderly man walking in the area.

They found 82-year-old Eiichi Negishi, of West Lafayette, and he was taken to a Rockford hospital.

Investigators later found the couple's vehicle in the nearby Orchard Hills Landfill along with Eiichi's wife, 80-year-old Sumire Negishi, who was pronounced dead by Ogle County coroner.

Investigators say the couple and their vehicle were reported missing to the Indiana State Police at 8 p.m. on Monday.

Eiichi is being treated at a Rockford hospital. Foul play is not suspected.

The couple and their car were reported missing Monday.