CENTENNIAL, Colo.—Court documents say prosecutors in the Colorado theater shootings have listed about 3,500 potential witnesses they could call during the trial of defendant James Holmes.

The estimate was in a motion filed Tuesday. None of the witnesses have been publicly identified.

Lawyers also say nearly 40,000 pages of documents about evidence have been filed.

Holmes is charged with killing 12 and injuring 70 in the July 20 shootings at a Denver-area movie theater. He faces multiple counts of murder and first-degree murder. Prosecutors are seeking the death penalty.

Holmes has asked to change his plea to not guilty by reason of insanity, but the judge hasn’t decided.

Another judge entered a standard not guilty plea on Holmes’ behalf in March when his lawyers said he wasn’t ready to plead.