One of the men charged in connection with a drug-related slaying in western Nebraska has pleaded guilty and agreed to testify against the man accused of shooting Adam McCormick.

The Sidney Sun-Telegraph reports  35-year-old Billy Fields pleaded guilty to being an accessory to a felony as part of a deal with prosecutors.

Fields agreed to testify at James Custer’s second-degree murder trial.

Custer is accused of fatally shooting McCormick on Nov. 3 in Sidney. Authorities have said they think the two men were arguing about $160 in drug money.

Prosecutors say Fields and Custer’s girlfriend, Amber Davis, both helped Custer flee to Big Springs after the shooting, and then provided misleading information to police.

Davis faces two misdemeanor charges, and she’s due back in court on Jan. 28.