The mother of a missing boy wants him declared dead.

12-year-old Ryan Larsen, who has autism, was last seen 20 months ago, on May 17, 2021.

According to authorities, he was last seen leaving his LaVista school around lunch time.

His mother, Tammi Larsen, is now asking a Sarpy County judge to appoint her in charge of her son’s affairs and rule him no longer missing.

According to her court filing, Tammi Larsen appears to blame the school: "Just before he exited the building, employees of the La Vista Elementary School, saw Ryan Larsen at school. No immediate action was taken to prevent him from exiting the school doors. Nor was any immediate action taken to retrieve him from outside the school building.

In a statement to KETV, a spokesperson for the school district said, "This is a tragic situation. Papillion La Vista Community Schools will continue to support Ryan's family, the staff and students of La Vista West Elementary and the community."

Shortly after the boy’s disappearance police admitted the case had them struggling for answers.

[Above: View NCN's interview with Police Chief Bob Lautsen, just weeks after Ryan's disappearance]

The search for Ryan Larsen found rescuers combing his neighborhood as well as a lake a few miles away.

At one-point police turned their attention to registered sex offenders living in the area but that part of the search went cold as well, in the town of seven thousand that borders Douglas County.

A court hearing is scheduled for next month.