Authorities investigating the disappearance of “TODAY” co-anchor Savannah Guthrie’s mother provided a timeline Thursday of the night she went missing as the search stretched into a fifth day.

The timeline was among the most precise information provided by Arizona law enforcement officials since Nancy Guthrie was reported missing around noon Sunday, setting off a desperate search that now includes both state and federal agencies.

Pima County Sheriff Chris Nanos, speaking to reporters at a news conference in the Tucson area, said the 84-year-old traveled to her daughter’s home for dinner at approximately 5:32 p.m. Saturday.

Savannah Guthrie has a sister who lives in the area.

Authorities located and spoke with the Uber driver who took Guthrie to her daughter’s house, Nanos said. He did not elaborate on what investigators learned.

Guthrie’s family dropped her back at her house at 9:48 p.m., when the garage door opened. The garage door closed two minutes later, Nanos said.

In the early hours of Sunday, at approximately 1:47 a.m., the doorbell camera at Guthrie’s home disconnected, according to the sheriff’s department sequence of events. Then, at 2:12 a.m., software detected a person on camera, but there is no video available, Nanos said.

Sixteen minutes later, at 2:28 a.m., Guthrie’s pacemaker app showed it had disconnected from her phone.

The Guthrie family checked on her at 11:56 a.m. after she did not show up at Sunday morning church services. The family placed a 911 call to the sheriff’s department at 12:03 p.m. and reported her missing, and the sheriff’s patrol arrived shortly after, at 12:15 p.m.

Reports indicate that ransom notes referencing Guthrie have been sent to at least three news outlets. NBC News has not seen copies of the notes, and no law enforcement agency has substantiated news reports about them.

Heith Janke, FBI Phoenix’s special agent in charge, told reporters that one of the reported ransom notes had a ᴅᴇᴀᴅline of 5 p.m. Thursday. He said there was a second ᴅᴇᴀᴅline on Monday.

Nanos reiterated that authorities have not identified a suspect or a person of interest in the case, which has drawn national attention. “We’re not there yet,” the sheriff told reporters. He also confirmed that blood found on the porch outside Guthrie’s house tested positive for her DNA.

Investigators believe Guthrie is “still out there” and remain committed to bringing her home safely.