After his capture, Russell Brown told state police that God told him to shoot and kill Walker, according to the court document. Brown also turned to the interviewing trooper and said that the trooper was the next to die.
Brown, 28, is charged with capital murder of a police officer, attempted capital murder of a police officer and use of a firearm in committing a felony.
According to the warrant, Brown told troopers he smoked marijuana on March 7, the day of the shooting. Police said found residue of a "green leafy substance" in the vehicle Brown was driving. Police also found a magazine containing two live rounds inside the car, according to the warrant.
Police said they spoke with Brown's grandmother who said she'd spoken to Russell recently and that over the last month or so he'd been talking about the bible and not making much sense. She said that was unlike her grandson, the warrant indicated.
The warrant also indicated Brown's landlord recently called the suspect to inform him he was behind on his rent. The landlord said he noticed Brown had not been acting like himself.
Brown is due back in court on Monday, March 18.
On Tuesday, thousands of people attended a funeral service for Master Trooper Walker. Governor McDonnell was among the speakers who honored the fallen trooper.