Among the 41 calls to 911, one stands out. In the 27-second call, the sounds of at least 30 shots ring out amid the chaos.
At some point, according to Pearson, one of Holmes' weapons jammed.
"Had the AR-15 not jammed, he would have killed more people," she said.
Investigators found 76 shell casings in the auditorium. Most of the spent rounds -- 65 -- were .223 caliber rifle rounds, six were shotgun shells and five were .40 caliber rounds from the Glocks, Appel said. Police also found one of the tear-gas canisters inside the theater, Appel said.
Also located was a large drum magazine for the rifle that appeared to have jammed, Sgt. Gerald Jonsgaard testified Monday.
The rifle cartridges were steel-core rounds, which are more likely to pass through a body intact and can cause multiple wounds, Fyles testified.
The movie theater's video system didn't capture anything from inside the theater but did capture the aftermath -- streams of terrified patrons running from the theater.
On Monday, police who were first to arrive described an eerie scene, stepping into a movie theater with "Batman" still blaring from the screen, blood from badly wounded victims flowing in the aisles and cell phones ringing over and over again, without answer.
Outside, the first officer to encounter Holmes -- who was still dressed in body armor, a helmet and a gas mask as he stood near his car -- described him as unnaturally relaxed. In fact, from Holmes' appearance, Officer Jason Oviatt thought he was a fellow police officer.
A trail of blood led from the theater. The rifle that authorities believe Holmes used in the attack lay on the ground near the building. Holmes was just standing there, Oviatt testified Monday.
"He seemed very detached from it all," Oviatt said.
Holmes, his pupils dilated, sweating and smelly, didn't struggle or even tense his muscles as he was dragged away to be searched, Oviatt said.
Police would cut off the body armor he wore and learn from him about the explosive booby-trap at his home.
Police described a strange scene in the interrogation room -- Holmes sitting in his underwear, T-shirt and white socks after police had had cut away his body armor -- making puppets of the paper bags officers had placed over his hands to preserve gunpowder evidence, according to Appel.
Holmes played with his polystyrene drinking cup as if it were a piece in a game. Appel said. Then he removed a staple from the table and tried to stick it in an electrical outlet, the detective testified.
Asked by a defense attorney whether he had ordered a blood test for Holmes, Appel said he had not.
"There were no indications that he was under the influence of anything," he said.