A Missouri man was sentenced on Wednesday to 20 years in federal prison for his role in the years-long sexual torture of a "mentally deficient" young woman that included electrical shock and mutilation, the U.S. Attorney's Office for the Western District of Missouri told CNN.

A federal judge accepted a plea agreement from Edward Bagley Sr., 46, in a Kansas City courtroom on Wednesday morning, the U.S. Attorney's Office said. In January, he pleaded guilty to one of the 11 counts he faced for having a sexual relationship with a minor, who was identified only by the initials "FV" (or Female Victim) in official documents. Bagley faced life imprisonment.

Bagley held the victim as a sex slave from December 2002 to February 27, 2009, in his Lebanon, Missouri, trailer home. The woman - who was a runaway minor at the time when the abuse began - was sometimes "hung upside down," "water boarded" and had animals she cared for shot in front of her by Bagley to coerce her to engage in commercial sex acts, the indictment read.