An 83-year-old woman with Alzheimer’s disease who was found dead Christmas Day had been discovered missing from her Sandy nursing home hours before she was reported missing, authorities say.

Sandy Police Sgt. Sam Craven said surveillance footage shows Ki Soon Hyun wandering outside the Mt. Hood Senior Living complex at 8:47 a.m. Dec. 24 — but police weren’t notified of the disappearance until 2:50 p.m., six hours later.

A marketing department employee at the memory-care facility, Cat Long, confirmed the delay. “The reason for the gap was our staff were looking for the resident throughout the building and outside,” she said.

Long declined to provide further details, including how Hyun managed to leave the building undetected, citing an investigation.

Elisa Williams, an Oregon Department of Human Services spokesperson, said Mt. Hood Senior Living failed to notify the agency of the disappearance within 24 hours, as required by law.

Family members are outraged that the facility took so long to report Hyun’s disappearance, saying they didn’t learn that she had gone missing until late on Christmas Eve.

“We lost the daylight,” grandson Tim Hyun told The Oregonian. “We should have been notified the moment she was outside.”

The 37-year-old said his grandmother had just moved into memory care at the senior facility the day before, Dec. 23, and wasn’t familiar with the area after living in Portland for 30 years.

Tim Hyun said that, once he learned she was missing, he drove to Sandy and scoured the area. He said that by then employees at the few stores that were still open knew of the disappearance from alerts on their cellphones.

Ki Soon Hyun, who was known by the nickname “Harmony,” had raised five kids of her own in Korea and then moved to Portland to help take care of Tim and her other grandsons when they were children, Tim Hyun said.

“She was everyone’s grandmother,” said Tim Hyun, recalling her love of hiking and family trips to Mount Saint Helens, Crater Lake and Multnomah Falls.

Temperatures dropped into the 30s as Ki Soon Hyun remained missing overnight into Christmas Day. Authorities found her body in the morning in steep, heavily forested terrain just 2,000 feet northwest of the senior-living facility.