DENVER (AP) — As many as 3,500 prospective jurors will be summoned when Colorado theater shooting suspect James Holmes goes on trial, another measure of the complexity and sensitivity of the case.Judge Carlos A. Samour Jr. included the estimate in a ruling dated Friday. The ruling granted a defense request to have all prospective jurors fill out questionnaires before they are questioned by lawyers.Holmes is charged with more than 160 counts of murder and attempted murder. He is accused of planning and executing an assault on a packed movie theater in a Denver suburb in July, killing 12 people and injuring 70.Among the dead were a 51-year-old father who had gone to the theater with his two teenage children.