206 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.

Diana Robertson

Death by Force
Case Description
Any updates on this case? Let us know!
On a winter day in 1985, a young Caucasian mother named Diana Robertson, age 21, ventured into the mountains near Tacoma, Washington, an outing that would become her last. On December 12th, she, her 36-year-old boyfriend Mike Riemer, and their two-year-old daughter, Crystal, set off in Riemer’s pickup truck to find a Christmas tree and for him to check his animal traps. The day took a dark turn when their daughter was found wandering alone that afternoon outside a Kmart in Spanaway, miles from ...Read More
Links to Additional Sources (11)
See any mistakes? Let us know!
  • Diana Robertson - Unsolved Mysteries
  • Diana Robertson & Mike Riemer: Terror In The Trees
    •     ...View 9 additional sources
    Victim Details

    Diana Robertson

    Female

    White / Caucasian

    Pierce County

    WA

    1985-12-12

    21

    Diana

    Robertson

    11/09/2025

    Forum Posts (1)
    I've been digging into the details of the Diana Robertson case, and something has been puzzling me. ... ...Read More
    04/11/2024
    Other Cases from Pierce County, Washington

    Mike Riemer

    Death: Dec 12, 1985
    On a cold December day in 1985, 36-year-old Mike Riemer, a White male, vanished from the rugged land n ...Read More