Crime Solvers Central
CSC
263 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.
Marilyn Koski missing person case profile photo

Marilyn Koski Missing Person Case

Last seen in Portland, Oregon on Jan 01, 1989

Victim Details

Jan 16, 2012

Jul 17, 2023

Marilyn

Koski

72

35

62 inches

64 inches

130 lbs

140 lbs

White / Caucasian

Female

Jan 01, 1989

Portland

Oregon

Multnomah County

No

11218

Multnomah County Sheriff's Office

Portland

Oregon

Multnomah County

97214

Keith Krafve

Detective Sgt.

501 Southeast Hawthorne Boulevard, Suite 350, Oregon

5039884300

County

Law Enforcement

https://www.mcso.us/site/

89.24

Multnomah County Sheriff's Office

Blond/Strawberry

Blue

Blue

07/04/2026


Area Last Seen:

Case Description

Any updates on this case? Let us know!
The start of a new year brought a somber mystery to Portland, Oregon, in 1989 with the disappearance of 35-year-old Marilyn Sue Koski. In the early hours of January 1st, Marilyn, a resident of a houseboat on the Willamette River, vanished. She was a woman with a notable educational background, holding degrees from both Brigham Young University and Oregon State University, and had previously dedicated her time to teaching physical education and health. Concern for her well-being grew after two no ...
MEMBER ACCESS

Continue reading the complete case summary

Unlock the full case narrative for Marilyn Koski, all available source links, additional videos, and member discussions.

Unlock Full Case Access — $3.97/month
Cancel anytime.
Already a member? Log in

Last Seen: Jan 01, 1989

Links to Additional Sources (6)

See any mistakes? Let us know!
  • Missing Person / NamUs #MP13616
  • Marilyn Sue Koski - The Charley Project
    • MEMBER ACCESS

    Unlock 4 additional sources

    View the complete collection of available reporting and reference links for this case.

    View All Case Sources — $3.97/month
    Cancel anytime.
    Already a member? Log in

    Latest News

    View All

    Forum Posts (3)

    I’ve been revisiting Marilyn Sue Koski’s case and something about her leaving those notes just d... ...Read More
    05/27/2024
    Has anyone looked into the local community around where Marilyn was living at the time? I mean, livi... ...Read More
    01/31/2024
    Has anyone else been following the Marilyn Sue Koski case from 1989? I was reading about her living ... ...Read More
    06/27/2023
    MEMBER ACCESS

    Join the discussion for Marilyn Koski

    Read full forum posts and contribute to this case discussion.

    Unlock forum access — $3.97/month
    Already a member? Log in

    Other Missing Cases from Portland, Oregon

    Lucy Riggs missing person case in Portland, Oregon

    Lucy Riggs

    Missing: Oct 20, 2024
    Lucy Riggs, a 16-year-old female, was reported missing from Portland, Oregon, with her last known da ...Read More
    Rachel Mobley missing person case in Portland, Oregon

    Rachel Mobley

    Missing: Nov 03, 2024
    In the early morning hours of November 3, 2024, 23-year-old Rachel Diane Mobley left her job in Port ...Read More
    Ana Dalilah Jimenez Perez missing person case in Portland, Oregon

    Ana Dalilah Jimenez Perez

    Missing: Dec 02, 2022
    In the winter of 2022, a then five-year-old girl named Ana Dalilah Jimenez Perez disappeared from Po ...Read More
    Winnefred Freeman missing person case in Portland, Oregon

    Winnefred Freeman

    Missing: May 08, 1968
    In the spring of 1968, a young woman named Winnefred Jeanette Freeman, age 20, disappeared from Port ...Read More
    Tracy Oldfield missing person case in Portland, Oregon

    Tracy Oldfield

    Missing: Nov 01, 2019
    In the fall of 2019, a 25-year-old woman named Tracy Lynn Oldfield vanished from Portland, Oregon. S ...Read More
    Julie Vaughn missing person case in Portland, Oregon

    Julie Vaughn

    Missing: Apr 18, 1991
    In the vibrant city of Portland, Oregon, a dark chapter began to unfold in the spring of 1991. Julie ...Read More
    Lisa Briseno missing person case in Portland, Oregon

    Lisa Briseno

    Missing: Aug 20, 1997
    In the late summer of 1997, a 28-year-old woman named Lisa Pearl Briseno vanished from Portland, Ore ...Read More