Kevin Ricks, a former Manassas high school teacher who last year was convicted in state court of molesting a teenaged boy, is scheduled for a plea hearing in federal court Thursday morning at which he is expected to plead guilty to child pornography charges, according to court documents and law enforcement sources.

Ricks is scheduled to appear in U.S. District Court in Alexandria, came as part of a deal to secure a lengthy prison sentence for Ricks while sparing numerous victims from his decades-long teaching career from having to testify at trials.

The federal charges stem from explicit photographs and videos of teenaged foreign exchange students he hosted in his home and of students he taught.

A Washington Post investigation published in July discovered 10 boys who were molested by Ricks or suspect they were being targeted by him, dating back to the late 1970s.

The Post has since found at least five additional victims or boys who believe they, too, were being targeted for abuse, including a young boy Ricks babysat while a student at the University of North Carolina in 1981 and another Manassas boy who lived near Ricks at the time of his arrest in February 2010 and believed he might have been the next victim had Ricks not been taken into custody.

Now almost 51 years old, Ricks likely will not be free again until after his 75th birthday. His earlier conviction for molesting a 16-year-old boy, before Thursday his only conviction for a sex offense, got him a 1-year jail sentence in Prince William County and forced him to register as a sex offender, effectively ending his teaching career.

There are outstanding local charges against Ricks in North Carolina and in Caroline County, Md., where Ricks is accused of molesting boys, and it is unclear whether those cases will go forward.