PIERRE -- A Lower Brule man was sentenced to six months in prison by a federal court Monday for illegally possessing a firearm in January 2016.

Myron Walters, 60, who had previously been convicted of a felony and is not permitted to have guns, pleaded guilty to the offense in March.

On Jan. 31, 2016, Lower Brule law enforcement was told Walters had threatened a woman and her family. Walters was found in an idling vehicle by officers who responded to the residence where the incident had been reported.

According to court documents, as Walters got out of the vehicle, an officer saw a pistol in his pocket. He eventually dropped the gun to the ground, and it was picked up and found to be fully loaded with a round in its chamber.

Walters is a registered sex offender and was convicted in 1992 of second-degree rape, a Class 1 felony, in a South Dakota circuit court. The firearm offense fell under federal jurisdiction by occurring on tribal land and involving a gun transported via interstate and foreign commerce.

Walters was indicted and arrested in April 2019, and he was initially released pending trial. In October 2019, according to court documents, he was arrested for assault charges against the woman he's said to have threatened in 2016 and was reported to have driven to his change of plea hearing with the same woman, violating the conditions of release that prohibited him from having contact with that woman without third-party supervision.

In addition to his time in custody, Walters was ordered to spend two years on supervised release, pay a $100 special assessment and forfeit the gun and ammunition he illegally possessed.