A man from Federal Dam, Minn., will spend the rest of his life in prison for sex crimes against children dating from the early 1980s through 2014, according to a federal judge's sentence in Minneapolis on Wednesday.

U.S. District Judge David Doty sentenced Rex Lee Furman, 53, to life plus another 10 years for his 2015 conviction on 18 charges related to child pornography.

Furman — who was convicted after a three-day jury trial in October 2015 — photographed and recorded the sexual abuse of two young girls in 2012, less than a year after he was released from a state prison for his second criminal sexual conduct conviction for violating a developmentally disabled young girl.

Those images were among more than 500 videos and photographs authorities found at Furman's home during a February 2014 search. The search also revealed a computer monitor mounted over Furman's bed and a security camera stationed outside the bedroom door.

In a statement Wednesday, Assistant U.S. Attorney Melinda Williams called Furman a "determined and dangerous predator who spent decades abusing and raping little girls."

"His days of harming the most vulnerable in our society have finally come to an end," Williams said.

Williams prosecuted the case alongside Deputy Chief Alexandra Gelber of the Department of Justice's Child Exploitation and Obscenity Section.

Furman's attorney, Manvir Atwal, said that he maintains that he did not commit the crimes and plans to appeal the sentence.

Undercover agents from the Bureau of Criminal Apprehension and Minneapolis Police began investigating Furman in 2013. When authorities arrived to search his home, Furman said he knew why they were there and that most of what they would find "is art," according to court documents. He also admitted to downloading and sharing child pornography on "peer-to-peer" file-sharing programs.

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