GREAT FALLS, Mont. (AP) — A man who was convicted of killing a Cascade County sheriff's deputy in 2014 has made a plea deal with federal prosecutors on additional drug and weapons charges.

Under the agreement filed Tuesday, Adam Sanchez Jr. plans to plead guilty to possession with intent to distribute methamphetamine and possession of a firearm in furtherance of a drug trafficking crime.

Federal prosecutors agreed to recommend a lighter sentence for accepting responsibility for the crime. They also agreed not to prosecute his mother, Susan Sanchez, for any role she might have played in his crimes.

U.S. District Judge Brian Morris set a change of plea hearing for April 26.

Sanchez was sentenced in December to life in prison without parole for the death of 33-year-old Deputy Joe Dunn during a high-speed chase.