ANSON, Texas (CBSDFW.COM/AP) — An inmate at a West Texas lockup serving 25 years for sexually assaulting a child has been sentenced to death for killing a female corrections officer.

A Jones County jury on Tuesday ordered the death penalty for 24-year-old Dillion Compton. Jurors on Oct. 15 convicted Compton of capital murder in the July 2016 slaying of guard Mari Johnson.

Dillion Gage Compton, 21 (photo courtesy: Myspace)

Prosecutors say Compton was found with scratches on his face and his skin underneath Johnson’s fingernails.

Her body was found in a storage room at the Robertson prison unit in Abilene and prosecutors say she suffered blunt force trauma and a crushed throat.

The defense claimed the injuries were sustained when Compton attempted an “aggressive” form of CPR on her. They also claimed Compton and Johnson had a sexual relationship.

Deliberations in the penalty phase began Monday in Anson, 200 miles west of Dallas.

Records show Compton’s prior sentence was for a 2010 Dallas County case in which a girl was raped.