A Warm Springs man has pleaded guilty to his role in two killings that occurred six days apart on the reservation last fall.

Curtis Lamont Brown, 39, was arrested in October 2012 and charged with second-degree murder in the death of Jonas Miller, 33, and in a separate case was charged with being an accessory after the fact to first-degree murder in the death of Faron Lynn Kalama, 30.

A plea agreement filed in court Nov. 4 indicates prosecutors recommend Brown be sentenced to 20 years in prison for his role in the slayings. He is scheduled to be sentenced on Feb. 19.

According to an affidavit filed in October 2012, Brown told an FBI agent he shot Miller with an assault rifle by accident. According to the affidavit, Brown told the agent he was in his car when Miller flagged him down and asked for a ride home.

During the drive, Miller offered to sell Brown an assault rifle for $300, and the pair drove to a path near County Line Road to test the weapon.

Miller handed Brown the rifle, and he pointed it at the back of Miller’s head and pulled the trigger, the affidavit states.

Hunters found Miller’s body near the road on Sept. 30. An autopsy found he died of a gunshot to the head.

Kalama’s body was found Oct. 5 in another remote part of the reservation, and Brown was, according to his plea, involved in that killing as well.

According to earlier court appearances, Tana Chris Lawrence and Angeledith Saramaylene Smith allegedly burglarized Kalama’s home on Sept. 29, 2012, beating her with wrenches and kidnapping her.

The pair then allegedly took Kalama by van to an isolated spot on the reservation, where she tried to escape. Lawrence allegedly chased the woman, breaking a beer bottle over her head and sodomizing her with another object.

Brown allegedly helped the pair dispose of Kalama’s body and clean the van. An autopsy revealed Kalama died of blunt force trauma to the head and face.

Lawrence and Smith were originally arraigned on one count each of first-degree murder involving burglary, kidnapping, aggravated sexual abuse and sexual abuse. But in a second, superseding indictment filed in October, Lawrence and Smith were charged with two counts of first-degree murder in the death of Kalama, while Brown is charged in that case with being an accessory after the fact to first-degree murder.

Lawrence and Smith are due to be arraigned on the new indictment Monday in federal court in Portland.