"People just don't vanish into thin air," says Chris Dewey, as the search for his mother continues for a third week. Authorities in Spring Valley, Ill., say Deborah Dewey, 62, texted a friend at 7am on Aug. 22, then ran some errands, but failed to show up for work the next day. A week later, her unlocked car was found in a truck stop parking lot about an hour from her home, with her purse and keys inside, leading her son to suspect foul play. "Whenever she had to go anywhere far, I'd drive her or a friend would. She didn't like driving on the interstate or at night," he tells Dateline, per NBC News. He adds that Dewey's medication and phone charger were left at home, per SaukValley.com.
It isn't clear how long Dewey's 2007 Buick LaCrosse had been parked at the truck stop in Morris, Ill., or whether Dewey had driven it. Police say Dewey—described as white, 5-foot-5, 150 pounds, with short gray hair, brown eyes, and glasses—was not seen on surveillance footage from gas pumps or a truck stop restaurant, reports the Herald-News. "We're looking down every avenue, and we're going to keep looking," an investigator says, noting officers have carried out air missions and asked Illinois State Conservation Police to scan the Illinois River with sonar devices. A $10,000 reward has been offered for information leading to Dewey's return. (The remains of a woman missing 40 years were just found.)