ALLIANCE, Neb. (AP) — Western Nebraska authorities continue investigating last week’s fatal standoff when a gunman wounded three officers and his pharmacist hostage before dying in a shootout with police.

Court documents say 27-year-old Andres Gonzalez told negotiators he killed 38-year-old Josh Bullock last December and told his girlfriend, 19-year-old Rose Siefke, he killed his father, 62-year-old Larry Gonzalez, before the June 12 standoff began.

Siefke is charged with helping conceal Bullock’s body. She appeared in court Tuesday, and is being held on $50,000 bond. Her attorney didn’t immediately respond to a message.

Box Butte County Attorney K.J. Hutchinson says autopsy results on Gonzalez and his father weren’t available Wednesday.

A grand jury will review Gonzalez’ death because police were trying to arrest him, but Hutchinson isn’t sure when that will happen.