According to information in the plea agreement, Windsor paid $79.99 for a subscription to a Web site in order to access and receive child pornography over the Internet, the release said.
As part of Operation Emissary III, which targets users of child pornography Web sites, Immigration & Customs Enforcement agents on April 24 executed a federal search warrant at Windsor's home and seized computers and other digital evidence.
Computer forensic analysis of the digital media seized from Windsor's home revealed he had possessed and received at least three videos of varying lengths, and seven images of minors, including prepubescents, engaged in sexually explicit conduct, and sadistic and masochistic depictions of violence/bondage, the release said.
The items were received over the Internet and remained stored on the computer, the release said.
Three additional videos, each more than an hour long, appeared to have been surreptitiously recorded while minor females were changing their clothes, according to the release. The videos were taken during the time Windsor was working at the middle school in connection with the production of a play, and the minor females were participants in the play, the release said.
Windsor directed them to change in rooms where he had hidden a camera, the release said.
Windsor was scheduled to enter a plea Wednesday afternoon in Frederick County Circuit Court to state charges of five counts of sexual abuse of a minor and five counts of prurient intent relating to that incident, a spokeswoman with the Frederick County Circuit Clerk's office said.
Federal agents observed more than 1,500 pages of stored chat communication under different screen names where Windsor routinely assumed the online persona of a female between the ages of 12 and 16, sought out minor females in chat rooms, and solicited images of minor females naked and/or engaged in sexually explicit conduct, the release said.