UPDATE
CENTENNIAL, Colo. (AP) -- Judge enters not guilty plea on behalf of Holmes in deadly Colorado theater shooting.
The judge says Holmes can change his plea to not guilty by reason of insanity later, if he chooses.
A defense lawyer said he didn't know how much time was needed. Prosecutors asked the judge to keep the case moving ahead.
Holmes sat silently at Tuesday's hearing with unruly hair and thick beard.
If convicted, Holmes could be executed or spend the rest of his life in prison.
He's charged with multiple counts of murder and attempted murder. Twelve people were killed and 70 wounded in the July 20 attack on moviegoers in Aurora.
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CENTENNIAL, Colo. (AP) -- An arraignment hearing is under way in a Denver suburb for James Holmes, the man charged with an attack last summer at a movie theater.
Many expect Holmes to plead not guilty by reason of insanity. If that happens, he'll get a mental evaluation to determine whether he could distinguish right from wrong.
If he's acquitted on the grounds of insanity, he would be committed indefinitely to the state mental hospital. If jurors find him guilty, he could be sentenced to execution or life in prison.
Holmes is charged with killing 12 people and injuring 70 in the July 20 shootings at a midnight showing of "The Dark Knight Rises" in Aurora.
