What to know about the investigation into Nancy Guthrie's disappearance

"The Federal Bureau of Investigation released surveillance videos of a masked person wearing a handgun holster outside Guthrie's front door in Tucson the night she vanished. A porch camera recorded video of a person with a backpack who was wearing a ski mask, long pants, jacket and gloves. On Thursday, the FBI called the person a suspect. It described him as a man about 5 feet, 9 inches tall with a medium build."

"Investigators collected DNA from Guthrie's property which doesn't belong to Guthrie or those in close contact with her, the Pima County Sheriff's Department said. Investigators are working to identify who it belongs to. Evidence requiring forensic analysis is being sent to the same out-of-state lab that has been used since the beginning of the case, the department said."

"Purported ransom notes were sent to news outlets, but two deadlines for paying have passed. Authorities have expressed concern about Nancy Guthrie's health because she needs vital daily medicine. She is said to have a pacemaker and have dealt with high blood pressure and heart issues, according to sheriff's dispatcher audio on broadcastify.com. Here's what to know about her disappearance and the intense search to find her: Video of masked man"

Nancy Guthrie, 84, was last seen at her Arizona home on Jan. 31 and was reported missing the following day. Blood was found on her front porch that does not match known household members. Purported ransom notes were sent to news outlets, but two payment deadlines have passed. Authorities express concern because she requires vital daily medication and has a pacemaker and a history of high blood pressure and heart issues. The FBI released footage of a masked person near her door carrying a 25-liter Ozark Trail Hiker Pack. Digital forensics recovered doorbell images after an initial report of no active subscription. The suspect is described as about 5 feet, 9 inches tall with a medium build wearing a ski mask, jacket, long pants and gloves. Investigators collected unidentified DNA from the property and sent evidence to an out-of-state lab while continuing to analyze leads.

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