Dec. 14, 2012, just 11 days before Christmas, 20-year-old Adam Lanza killed his own mother in their Newtown home before he went to Sandy Hook Elementary School and began his murder-spree using a semiautomatic rifle. His violent massacre left 20 students and six educators dead.

After his attack on the school ended, Lanza used a Glock handgun to end his own life before the cops could apprehend him.

What has eluded investigators and commentators is the motive for his horrific actions, according to former homicide detective Norman Santiago.

“People — including criminologists, journalists and politicians — are left with conjecture when it comes to Lanza’s motive for killing innocent children. It’s also anyone’s guess as to why he committed matricide when such killings are quite devastating to the murderer,” said Santiago, who investigated homicides in New York for more that a decade.

However, the local prosecutor determined there may have been a connection since the investigators uncovered evidence that, as a child, Lanza had been bullied in elementary school.

Since the incident many stories have come out of heroism and heartbreak. 6 teachers and 20 children died in this horrific tragedy.

To help honor Anne Marie Murphy, Victoria Leigh Soto, Lauren Rousseau, Mary Sherlach, Rachel D’Avino, and Dawn Hochsprung