A suburban Oklahoma City teen told investigators that his older brother told him that he shot and killed their parents because they had been communicating with him telepathically and were Satan worshippers, according to an affidavit released Tuesday.

The 17-year-old called police at around 2:30 a.m. Monday after waking to the sound of his mother screaming and hearing gunshots, police wrote in the affidavit. He then saw his mother in the hallway and she told him to call 911.

"He looked into the hallway again and saw his brother ... walking down the hallway holding his gun," according to the document. "He advised that his brother often carries the gun around the house with him because he is paranoid."

Police found the bodies of Michael Logan Walker, 50, and Rachel Walker, 44, inside their Edmond home and arrested their 19-year-old son, Michael Elijah Walker, on preliminary first-degree murder charges. He is jailed without bond and records don't list an attorney for him.

A police spokeswoman, Jenny Wagnon, said Tuesday that investigators have no other suspects and don't expect to make further arrests.

The younger brother said his older brother "shot their parents because they were sending him messages telepathically and they were Satan worshippers," and "that everything was OK, and he would bury the bodies," police say in the affidavit, which redacted the name of the younger brother.

The defendant told police his parents had not harmed him, and that he shot them during an argument in his bedroom after he asked them a question about Satanism, the document states.

According to the affidavit, the defendant said he shot his father "anywhere I could hit him" after his father "tackled" him. He said he then chased and shot his mother several times as she tried to flee down a hallway. He said he returned to his room to reload and shoot his mother again because he thought she was still alive, and to get a pillow that he placed over the back of her head "and shot once or twice through the pillow because the gun was very loud, indicating the noise from the gunfire was hurting his ears."

Walker told investigators "that he believed he did the right thing," and "would react the same way if he had it to do over again," the document states.