Lynne Diane Siewert, 54, was last seen on March 23, 2023, at the Seiad Valley Post Office in Seiad Valley, California. She is described as a white female, 5 feet 3 inches to 5 feet 5 inches tall, 135 to 145 pounds, with blonde hair and blue eyes, and may also use the last name Smethurst.

In late April 2023 the black truck she was known to be driving was found abandoned and stuck on a Forest Service Road. Searches of the vehicle and surrounding area followed but produced no significant leads. Frustrated by the lack of progress, her family conducted their own searches at the site, interviewed people, and collected items they found near the truck; those items were turned over to the Siskiyou County Sheriff’s Office.

As of November 13, 2024 Lynne remains missing and her family continues to seek information. Anyone who knew Lynne, saw her in Seiad Valley around March 23, 2023, or has relevant information is asked to contact the Siskiyou County Sheriff’s Office at (530) 841-2900.