Authorities have not recovered the gun, or guns, believed to have been used in the shooting, but Kent said more weapons were found in the house.
In 2002, Miller was charged in San Francisco with making and selling marijuana for distribution, being a felon in possession of a firearm, possessing a machine gun and money laundering, according to court records. He pleaded guilty to being a felon in possession of a gun and was sentenced to three years and 10 months in prison. He was released in May 2007, according to the federal Bureau of Prisons.
The two-story house where the shooting took place is nestled among pine trees, with a detached garage and shed in the back. The Record Searchlight of Redding reported that horses and llamas graze on the property.
Investigators had not determined a motive for the shooting, but Kent noted deputies had gone to the home last month on a domestic dispute call.
Schools in the rural community of about 2,000 people were locked down during the day Wednesday, and a forest harvest demonstration for local schools set for Wednesday and Thursday was rescheduled for next week.
Miller's two daughters both attended school in the Black Butte Union Elementary School District, superintendent Don Aust told The Record Searchlight.
The girls' parents pulled Shelby out of the elementary school and Shasta out of the preschool programs around three to four weeks ago.