Marilyn Sue Koski, 35, disappeared from her houseboat on the Willamette River in Portland in the early hours of January 1, 1989. Two notes were found after her disappearance — one addressed to her next-of-kin and another to her roommate — and their content suggested the possibility of self-harm. Because she lived on a houseboat, investigators focused searches on the Willamette River and treated drowning as a strong possibility, but no body was ever recovered.

Marilyn had degrees from Brigham Young University and Oregon State University and had worked teaching physical education and health. When she was last seen she was wearing blue jeans, a pink and white shirt, a gray sweatshirt, a purple and blue jacket and fur boots. A memorial service was held later that month; the Multnomah County Sheriff’s Office still lists the case as open and cold.

Did anyone who knew Marilyn or who lived near the Willamette in 1989 notice anything unusual around New Year’s Day?