The trial for the man accused of killing 12 people in a movie theater in the west of the United States had been postponed indefinitely, according to a court decision. The court is to hold a hearing on Dec. 17 and Dec. 18 to determine whether James Holmes will undergo more psychiatric examination, and when his trial will be held. James Holmes, 25, has pleaded not guilty by reason of insanity to charges of murdering at Aurora theater in July 2012, one of the worst mass murders in the United States' history. District Court Judge Carlos Samour Jr. will in the next three weeks consider prosecution motions of asking for one more psychiatric evaluation of Holmes, that will delay the long-anticipated trial date. Court officials said on Thursday that they expect the trial to begin in April, 2014. Holmes's attorney Tamara Brady will have to file a motion until Dec. 6, countering the prosecution's request for their experts to examine Holmes. Prosecutors asked psychiatric experts to analyze Holmes and "revisit" one of three determinations revealed in a document on his condition by psychiatric experts, who analyzed Holmes over the summer in Pueblo, Colorado. Legal experts said the requested examination by prosecutors will try to establish Holmes'sanity at the time of the shootings, a condition required for his execution.