CENTENNIAL, Colo. — Lawyers for the Colorado theater shooting suspect told a judge today he wants to change his plea to not guilty by reason of insanity, but the judge won’t immediately rule on whether to allow it.

Attorney Daniel King made the request in court, saying the defense now has a diagnosis for James Holmes, though he didn’t specify what it was.

Holmes, with bushy hair and beard, didn’t speak during the hearing after entering the courtroom with his eyes downcast.

Before deciding whether to accept a new plea, Judge Carlos Samour said, he would consider arguments about constitutional questions the defense has raised about Colorado’s insanity and death penalty laws.

He isn’t expected to announce his decision until May 31, when another hearing is scheduled.

Holmes’ lawyers announced last week that Holmes would ask to change his plea at the hearing.

Prosecutors are seeking the death penalty. They say Holmes, a former neuroscience graduate student, spent months acquiring weapons and ammunition, scouting a theater in the Denver suburb of Aurora and booby-trapping his apartment.

Then on July 20, dressed in a police-style helmet and body armor, he opened fire during a packed midnight showing of “The Dark Knight Rises,” prosecutors say. Twelve people died and 70 were injured.