Dorothy Hoffner, a 104-year-old Chicago woman whose recent skydive could see her certified by Guinness World Records as the oldest person to ever jump from a plane, has died.

Hoffner’s close friend, Joe Conant, said she was found dead Monday morning by staff at the Brookdale Lake View senior living community. Conant said Hoffner apparently died in her sleep on Sunday night.

Conant, who is a nurse, said he met Hoffner — whom he called Grandma at her request — several years ago while he was working as a caregiver for another resident at the senior living center. He said she had amazing energy and remained mentally sharp.

“She was indefatigable. She just kept going,” he said Tuesday. “She was not someone who would take naps in the afternoon, or not show up for any function, dinner or anything else. She was always there, fully present. She kept going, always.”