Douglas Gerald Mantei was 44 when he was last reliably seen in Maui. He regularly spent time in Pāʻia, Haʻikū, and Kīhei. The last confirmed contact was a phone call with family on September 29, 2020, and he was reportedly seen leaving the Wailuku Police Station on October 2, 2020 — that is the last verifiable sighting. His family filed a missing person report on October 13, 2020.

Reports differ on the exact time he went missing: most accounts point to early October 2020, while some agency records list June 24, 2020. At the time he disappeared he may have been experiencing homelessness. He is described as six feet tall, about 190 pounds, with brown hair, blue eyes, and a sparse short beard and mustache.

The Maui Police Department opened an investigation and asked the public for help; few new details have emerged. If anyone saw Douglas in September or October 2020 or has information about his movements around Wailuku, please share what you know with the Maui Police Department.