See pictures from inside the court Tuesday.
James Holmes appears in court on Tuesday, March 12, 2013.
Defense attorney Dan King (standing) argues before the court on Tuesday, March 12, 2013, saying that the defense was not ready to make a plea.
Judge William Sylvester entered a plea of not guilty for Holmes, despite defense objections.
James Holmes' parents, James and Arlene Holmes, were in the second row of the courtroom on March 12, 2013. They did not react to the proceedings and did not comment afterward.
Holmes wore a red jail jumpsuit and sported a thick, bushy beard and unkempt dark brown hair.
The trial date has been set for Aug. 1, 2013.