"...He left his favorite restaurant in Cave Creek, Harold's Corral, Monday night and made a wrong turn on his way home..."

If that's not a giant sign for his family to step in and start addressing the dementia, nothing is.

JBMat: "My Mom had dementia, and after one incident where she drove the wrong way to a neighbor's house, Dad convinced her the police had pulled her license."

Thanks for the idea. I'll use that tactic, too.