Nancy Guthrie’s son-in-law was the last person to see her before the 84-year-old mother of NBC star Savannah Guthrie vanished.

Savannah Guthrie’s brother-in-law, Tommaso Cioni, was the last person who saw Nancy Guthrie before she vanished, authorities have said.

Cioni, who is married to Savannah’s sister Annie, dropped Nancy back at her Tucson, Arizona home on Saturday evening after the 84-year-old had dinner with the couple. He ensured she made it safely inside the house before leaving, Pima County Sheriff Chris Nanos told the New York Times.

Nancy disappeared sometime between the dropoff at 9:45 p.m. and Sunday morning, when friends at church became concerned that she wasn’t there.

Nanos said Guthrie’s family have been cooperative with investigators, who have spent four days desperately searching for her. No suspects have been identified in the disappearance.

Police came to her house at noon on Sunday and found “something at the home that didn’t sit well,” Sheriff Nanos said, without elaborating.

Pictures from the scene show spatters of blood outside the front door, while there were signs of forced entry in the house, according to law enforcement sources.

Nanos said Guthrie’s family has been cooperative with investigators, who have spent four days desperately searching for her. No suspects have been identified in the disappearance.

The F.B.I. also paid a visit to Cioni’s Tucson house, around a 10-minute drive from Nancy’s according to authorities.

On Christmas Day, Nancy shared a picture on Facebook of the family wearing matching pajamas.

Cioni is seen standing next to his mother-in-law, holding a black dog.

Cioni is reportedly a sixth-grade science teacher at a Tucson-area school while his wife is the marketing director at the University of Arizona Poetry Center.

He reportedly moved to Tucson in 2006, according to a biography on an Italian cultural website, Tapirulan Cultural Association.

His wife previously described him as a “great manifester” and a “brilliant cook.”