Mary Kathleen Thill was 22 when she disappeared from Seward, Alaska, on July 5, 1975. That Saturday she was dropped at a local bakery after a friend gave her a ride into town, was later seen between 1:30 and 2:00 p.m. near the waterfall on Lowell Point Road, and was never seen again. Her husband was working on the Trans‑Alaska Pipeline at the time; friends say it was uncharacteristic for her to leave without telling anyone.

Investigators later examined a possible link to Robert Hansen, who was in Seward the weekend Mary vanished. A map found in Hansen’s home reportedly showed more location marks than the murders he confessed to, with two unaccounted marks in the Seward and Resurrection Bay area. A former inmate later claimed Hansen admitted killing Mary and disposing of her body in Resurrection Bay, but that account was never confirmed. Mary’s disappearance remains unsolved.

Did anyone in Seward in 1975 have information about where Mary spent that afternoon or who she might have been with?