Nancy Guthrie: Retired cold case sergeant on release of masked person photos l FOX 10 Phoenix

The release of surveillance images showing a masked person was a major break in the search for Nancy Guthrie.

Also on Tuesday, a person of interest was detained in connection with the case. He was later released.

Troy Hillman, retired cold case sergeant and the author of "Chasing Down the Zombie Hunter," joined AZAM to discuss the latest on the case.

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