NBC / Nathan Congleton/NBC via Getty I The search for the missing mother of Today show host Savannah Guthrie, 54, is entering a new phase as investigators sharpen their focus on key dates tied to her disappearance. 84-year-old Nancy Guthrie was last seen Jan. 31 at her home in Tucson, Arizona, but authorities are now widening the timeline of interest to dates 20 days prior to her disappearance. According to NewsNation’s Brian Entin, neighbors have been asked to turn over surveillance footage from Jan. 11 and Jan. 24—dates that could offer new clues about activity around her home. The shift comes after the FBI released Ring doorbell footage showing a masked, armed man outside Guthrie’s front door on Feb. 1. Investigators had previously sought video from Jan. 11 between 9 p.m. and midnight, and from the morning of Jan. 31, when Guthrie was last seen. Pima County Sheriff Chris Nanos said on March 3 that investigators are “definitely closer,” adding they have gathered “a lot of intel” and leads, while ruling out Guthrie’s family as suspects. The FBI is offering a $100,000 reward for information, and the Guthrie family has pledged an additional $1 million. The Daily Beast has contacted the Pima County Sheriff’s Office for comment. Read it at People Read more at The Daily Beast.