The 41-year-old "faced two first-degree charges, one concerning the distribution of images of child exploitation and one concerning the possession of said images, according to court documents."
Miyasato is being held in King County on $50,000 bail, per Susannah Frame of KING 5. Arraignment is scheduled for January 21.
The Seahawks released a statement saying that Miyasato was no longer employed with the team following the arrest: "We are aware of the situation and in accordance with the NFL personal conduct policy, we have notified the league of his arrest. This individual is no longer employed by our organization."
Miyasato had worked with the Seahawks for 10 years, per Halverson.