India, April 12 -- A forensic expert has come up with the theory that Nancy Guthrie's abduction may have been tied to a "revenge" ploy. 'Today' show host Savannah Guthrie's 84-year-old mother disappeared from her Tucson home on February 1.

Researcher Dr. Ann Burgess said in a recent episode of Brian Entin Investigates that Nancy may have been kidnapped as an act of retribution. "I think something went very wrong inside the house," she said, noting there was blood found at the scene.

"Who in her orbit - let's call it that, it could be family, it could be friends - would be hurt the most [by the kidnapping]?" Ann wondered. "Something could have come up there that we don't know about, and that's up to people in her orbit to figure out. Bec...