Missing Plymouth man, 69, still not found

During the news conference, police shared a picture of a silver Nissan Armada whose driver may have given Riviello a ride. A man wearing the same sort of sneakers Riviello wears was seen getting into the car, which left the hospital shortly before 12:30 pm and headed in the direction of the rotary at Plymouth North High School, police said.

His daughter said Riviello has memory and reasoning issues.

“My father did have some memory issues. He had a series of mini-strokes that had done some damage to his brain. And so he doesn't have a lot of logic and reasoning to make good decisions in order to get himself safely home ,” Michelle Riviello said, adding that the week's extreme heat adds an additional layer of concern. “I think I'd worry about myself in this heat for 26 hours.”

Plymouth police Capt. Jason Higgins said during the news conference that the search has already drawn a large, multiagency response.

“We're transitioning from a traditional ground search to an investigative research that leverages technology,” Higgins said. “We will continue to look for Mr. Riviello until he is found.”