A judge ruled late Thursday that there's enough evidence for James Holmes to face trial on charges that he killed 12 people and injured 70 others in a Colorado movie theater last summer.

Judge William Sylvester said prosecutors have established probable cause to proceed with 166 felony counts, including murder and attempted murder.

Holmes is due to be arraigned Friday, but his defense attorneys filed papers Thursday afternoon saying he's not ready to enter a plea. They are likely to appear in court Friday to ask for the arraignment to be delayed.