Samour formally sentenced Holmes to life in prison without parole for the murders of 12 people. He also was sentencing to more than to 3,200 additional years for attempted murder and an explosives conviction.
"It is almost impossible to comprehend how a human being is capable of such acts," Judge Carlos A Samour Jr said.
Samour also contrasted Holmes' bloody assault with the compassion of a juror who voted for a life sentence instead of the death penalty.
The judge had no other sentencing option on the murder charges after a jury earlier this month did not unanimously agree that Holmes should get the death penalty. Samour issued his sentence after two days of testimony from survivors of the attack, including first responders.
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But he first spent more than half an hour defending the integrity of the justice system and disputing complaints that the trial was a waste of time. He noted the proceedings gave family members an opportunity to tell the world about their slain loved ones and provided survivors the chance to talk about their ordeal.
"I believe in the system. I said that before, and I'll say it again. I believe in the system," Samour said.
Samour disputed some victims' suggestion that Holmes would have an easy life behind bars, noting prison is harsh and restrictive.
The formal sentencing followed two days of testimony from victims about the impact the shootings had on them, and a statement from Holmes' mother, Arlene, that her son feels remorse for his deadly attack on a Colorado movie theater.
"We know that is very, very hard for people to see," Arlene Holmes testified during her son's final sentencing hearing.
"We cannot feel the depths of your pain. We can only listen to everything you have expressed, and we pray for you... We are very sorry this tragedy happened, and sorry everyone has suffered so much."
With her husband, Robert, by her side, she was the final witness to take the lectern yesterday, capping a sentencing hearing where more than 100 victims and survivors testified about the searing physical and emotional scars the 2012 shooting has left.