Twenty-six people - 20 students and six adults - were shot and killed at the Sandy Hook Elementary School in Newtown, Connecticut on December 14. Details continue to emerge about what precisely happened.
Today, almost one year to the date, the Danbury State Attorney will release a long-awaited report into the shooting, CNN's Susan Candiotti reports.
He made sure families were briefed ahead of time about what he would reveal.
The summary of the 11-month investigation is expected "to include a timeline of shooter Adam Lanza's movements, beginning in the morning when he killed his mother, Nancy, at her home before driving to Sandy Hook Elementary School - where he blasted his way in through a glass window and fired over 150 shots from an assault rifle in about five minutes.”
It excludes the 911 calls alerting authorities to the shooting, however.
"The Connecticut State Freedom of Information Commission ordered the release of the tapes back in September, overruling objections by Newtown officials," Candiotti says. "Local residents are at odds over whether the calls should be made public."
Today, a court is expected to decide on their release.
Also, a more comprehensive account of the massacre, including photos and witness statements reportedly thousands of pages long, is set to be released in its entirety sometime next year.