Attorneys for accused mass murderer James Holmes told a Colorado judge Thursday that their client is mentally ill and they need more time to assess the nature of his illness, Associated Press reports.

The disclosure came in a hearing in a Colorado courtroom, where news media were asking a judge to unseal documents related to the mass shooting at an Aurora movie theater that left 12 dead and scores more injured. The AP notes that “Holmes had the same dazed demeanor that he has had in previous court appearances.”

Defense attorney Daniel King told the judge that his team needs more info from prosecutors and investigators before they can “begin to assess the nature and depth of Mr. Holmes’ mental illness.”