Sporting dyed reddish-orange hair and a dazed expression on his face, 24-year-old James Holmes was officially told he is being held on suspicion of first-degree murder.
The San Diego, California native did not speak during the 13-minute hearing in Centennial, Colorado.
Arapahoe County District Attorney Carol Chambers has since revealed that it may take up to a year to bring Holmes' trial to court, stating, "We're still looking at an enormous amount of evidence."
She told reporters outside the courthouse that she has not yet decided if she will fight for the death penalty, revealing that decision could take at least two months and will be made after discussions with the surviving victims and the relatives of all victims.
Twelve people were killed and 58 injured after Holmes, dressed in body armor, allegedly opened fire in a packed Aurora movie theatre.