HOPKINSVILLE, Ky. (AP) – Three defendants charged in the sexual assault of a 15-year-old boy at a house party in Hopkinsville have struck deals to testify against their alleged accomplice.

The Kentucky New Era reports that Colton Cavanaugh, Samuel Miller and Tyler Perry agreed to testify against the only remaining defendant still facing charges, Dayton Jones.

Cavanaugh entered a guilty plea Thursday to amended charges of first-degree sodomy and first-degree wanton endangerment. His plea came a day after Miller and Perry also pleaded guilty to various charges.

The four are accused of assaulting the incapacitated 15-year-old at Miller’s house during a party. Police reports say the boy suffered severe internal injuries following the assault.

Jones’ trial is set to begin Monday. Final sentencing has been set for Nov. 1.

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Copyright 2016 The Associated Press.