Ethel A. O'Neil disappeared July 16, leaving behind her poodle Missy and her anxiety and depression medicine.
She had been planning to go shopping for makeup at the Everett Mall, just a three-mile drive from her home.
Her son, Pat O'Neil, said last month that it's out of character for his mother to say she'll return and not, but he said she likely has early onsets of dementia.
At about 3:15 p.m. On Tuesday, the Snohomish County Sheriff's Office's helicopter rescue team found O'Neil's 1987 Chevy Nova in some bushes off the 13400 block of 12th Street NE in Lake Stevens, according to the sheriff's office.
After spotting the car, the flight crew investigated and found a body inside the car.
Aaron Snell with the Everett Police Department said the car was found in the back of some bushes and said its location was "very suspicious."
"Finding the vehicle was an important step to hopefully concluding this," Snell said.
Officials have yet to identify the body. The Snohomish County Medical Examiner's Office will take custody of the body to make identification and notify family as well as establish cause and manner of death.