Families of missing loved ones face a unique and agonizing grief called ambiguous loss. Experts explain this as the pain of uncertainty when a loved one's fate is unknown, leaving families in emotional limbo.

One person is dead and two others remain missing after a group was swept over a waterfall in Oregon on July 19, authorities said.

On Sunday, Lovett Moore’s family and friends, volunteers, strangers and clergy from as far away as the Bay Area began their search once again, gathering near the Arena Boulevard gas station where the legally blind and disabled Natomas man was last seen.

ABC News’ Reena Roy reports the search for missing 9-year-old Melina Frattolin ended in tragedy after police discovered her body in upstate New York.

Florida man, 79, was found dead after vanishing from the Mount Washington summit, ending a three-day search with his body recovered off-trail by rescuers.

Sixty miles of river. Murky waters, thick mud and seemingly insurmountable piles of debris. The painstaking recovery efforts continue for around 100 people still missing following the devastating July Fourth flooding along the Guadalupe River in central Texas.

Torrential rains in South Korea over five days have caused 17 deaths and left 11 people missing, officials report.

A mom who runs a jewelry store was baffled when the key to the cash register vanished—only to learn the truth when she checked CCTV. Jewelry designer Avigail Adam, 43, runs her own business, simply named Avigail Adam,