John Wirth of Petaluma had been lost a long time when police caught up with him in St. Helena late Thursday night, got him something to eat and drink, and brought him back home.
It had been more than 40 hours since the mentally disabled man had left on one of his usual bike rides, and clues from his ensuing odyssey suggest he may have pedaled as much as 60 miles along a sometimes treacherous route that included Highway 37 toward Vallejo, though there's no way to know for sure.
All he could tell authorities when his adventure came to an end late Thursday was, "I was just out for a bike ride," Petaluma Police Lt. Tim Lyons said Friday.
He was weary and worn, but "he was OK," Lyons said.
"There are no words that can say how grateful I am," said Wirth's sister, Mary Ann Grant. "I was so worried he wouldn't make it back."
Wirth, 48, suffered a traumatic brain injury in a near-fatal motorcycle crash 25 years ago and has lost his ability to perform many normal daily functions, Grant said.
The two moved north from Ventura County about a year ago to enjoy the relative peace and quiet of the North Bay, and Wirth enjoyed going out on his red bike each day from their Petaluma Way home near North McDowell Boulevard, often heading a couple miles down the road to McDonald's or Taco Bell, she said.
But Wirth had been venturing farther and farther, it seemed. He had recently been spotted cycling near the Kaiser medical center on Lakeville Highway, police Detective Joel Stemmer said.
"He doesn't really know the area," Grant said, "although I'm trying, little by little, showing him, 'You could do this. You could do that.'"
On Wednesday, Wirth left home at about 7 a.m. His sister had given him $10, Stemmer said.