Lanza shot himself in the head just as he heard police drawing near to the classroom where he was killing helpless children, but he had more ammunition at the ready in the form of multiple, high-capacity clips each capable of holding 30 bullets.
According to the New York Daily News, the disclosure on Sunday sent chills throughout the community, as families sought to comfort each other during church services and vigils to the dead.
Authorities said they found multiple 30-round magazines and hundreds of unused bullets at the school, which enrolled about 670 students.
The chief medical examiner said the ammunition was the type designed to break up inside a victim’s body and inflict the maximum amount of damage, tearing apart bone and tissue.
Student Emilie Parker’s life was tragically cut short during the devastating Sandy Hook massacre, which claimed the lives of 28 individuals, the report said.
The father of the 6-year-old recalled his ‘bright, creative, very loving’ daughter at a news conference where he sent condolences to the family of the killer.
"I can't imagine how hard this must be for them," Robbie Parker said, adding: "I'm not mad."
Governor Dannel Malloy said the shooter decided to kill himself when he heard police closing in about 10 minutes into the attack.
“We surmise that it was during the second classroom episode that he heard responders coming and apparently at that decided to take his own life,” Malloy said on ABC’s “This Week.”
Newtown officials couldn’t say whether Sandy Hook Elementary School, where the shooter killed 20 children and six adults, would ever reopen.
According to the report, 26 people, including 20 children, were killed by Lanza in a bloody Friday morning rampage at Sandy Hook Elementary School.