India, March 8 -- The family of Today co-host Savannah Guthrie is still waiting for a clear update in the kidnapping of her mother, Nancy Guthrie. The 84-year-old has been missing for over a month, but a suspect has not been identified yet.

As the search drags on without answers, a family therapist says the uncertainty surrounding the case can be particularly painful for loved ones.

"They're frozen in their grief. They have a real sense of helplessness," said Tai Mendenhall, a medical family therapist at the University of Minnesota, according to the Associated Press.

"There's no clear resolution from it. We know from research that ambiguous loss is the most psychologically painful kind of loss because of that."

The concept, known as "...