ROCK SPRINGS, Wyo. (AP) — A police officer in southwestern Wyoming has pleaded no contest to voluntary manslaughter for the death of a 2-year-old boy.

Jacob Anglesey, 35, of Green River, entered his plea Friday in the 2009 death of Konnor Allen, who suffered a head injury while in the man's care.

An initial investigation did not lead to charges, but the case remained open with the Wyoming Division of Criminal Investigation. In 2015, DCI agents presented evidence to the Sweetwater County Attorney's Office they said showed Anglesey was inconsistent when describing how the boy was injured.

Anglesey, who was set to go to trial Monday for first-degree murder, struck a deal with prosecutors and is facing a possible sentence of up to 20 years in prison.