The men who found her say her van got stuck on the trail, so she got out and fell into mud that she said was "like quicksand."
An independent search is underway for Nancy Guthrie's remains near the border following an anonymous tip about the whereabouts of her body, though authorities say there is no evidence to verify the claim.
Forensic evidence recovered from the electronic devices of Lynette Hooker's husband, Brian Hooker, have led investigators to new areas of interest.
The 52-year-old mother and wife is still missing after last being seen near her home in Oakland late March. "It's been terrible. We wake up every single day thinking about her. We go to bed every single night thinking about her," said Amy's sister, Alexandra.
The U.S. Coast Guard has seized the boat used by Americans Brian and Lynette Hooker.