Jeremiah E. Ramirez, 18, will be sentenced at 3 p.m. June 17 in Canyon County 3rd District Court.
Ramirez was 17 when he stabbed his mother with a knife 11 times last year in her Caldwell home, police said. He told officers that he heard voices telling him he needed to kill his mother, according to court records. Ramirez has been diagnosed with schizophrenia.
He also admitted to smoking "spice," or synthetic marijuana, the evening before the attack.
Ramirez pleaded guilty to aggravated battery. But at a scheduled sentencing hearing Tuesday, Judge Thomas J. Ryan said he didn't have enough information to determine if Ramirez's symptoms came from drug use or schizophrenia.
Ryan ordered Ramirez to undergo another mental evaluation, which could take four to six weeks to complete. The court will also subpoena medical records from Ramirez's stays in a mental hospital.
The teen was originally charged with attempted murder, but the charge was later changed to aggravated battery. An attempted murder charge would have required prosecutors to prove that Ramirez had intended to kill his mother, according to the Canyon County Prosecutors Office. Both charges carry a penalty of up to 15 years in prison.
Ramirez will remain in the Canyon County Jail until his new sentencing.