Derek J. Partridge was 47 when he was last known to have contact in Carmel, Penobscot County, Maine, on November 13, 2015. When last seen he wore blue jeans, a sweatshirt and carried a backpack; records note he had removed his watch and wedding band.

The public trail begins with a change in routine: Derek had quit his job and sent a text telling a family member where his truck could be found. On November 17, 2015, his vehicle was located in the Walmart parking lot in Palmyra. Surveillance reportedly shows him parking the truck there and walking away toward Route 2; after that moment there are no confirmed public sightings or contact. The investigating agency is Maine State Police Troop E in Bangor; the NamUs listing is MP32709.

If anyone saw Derek in the Palmyra area on or after November 17, 2015, or has information about his movements after he left the Walmart parking lot, please share what is known with the Maine State Police.