Brian's family has not been forthcoming with many details, other than letting authorities know he went missing last Friday after he was named a "person of interest" in Gabby's case. They said he took his backpack and went for a hike, but never came back.
Moab Police Department
As we reported ... Gabby's body was found 2 days later at a state park in Wyoming, a spot she and Brian are believed to have visited in the days after they had a domestic dispute in Utah.
The coroner ruled Gabby's manner of death homicide, and while the obvious suspect is Brian ... he's not officially been named one by police, at least not until they find out where he's at.