All of the victims died from gunshot wounds and all were struck more than once, according to H. Wayne Carver II, chief medical examiner for the state of Connecticut. Their deaths have been classified as homicides.
"I've been at this for a third of a century. My sensibilities may not be the average man, but this probably is the worst I have seen or the worst that I know of any of my colleagues having seen," Carver told reporters.
Of the children killed, all were either 6 or 7 years old -- 12 girls and eight boys. The adults ranged in ages from 27 to 56, and included the school's principal, psychologist and at least two teachers. State police released the victims' names and ages Saturday afternoon.
Lanza was found dead next to three guns, a semi-automatic .223-caliber Bushmaster rifle and two pistols made by Glock and Sig Sauer, a law enforcement source told CNN. All belonged to his mother.