He faces four counts of first-degree murder, seven counts of attempted murder and unauthorized possession of a firearm.
Colin Brough died; Nicholas Prato, Kyle Zientek and Nicholas Piring were wounded.
"Even people that believe in the right to bear arms, what right do you have to take someone's life?"
A Seattle court found him guilty of illegally owning guns, one of which his son used to kill four friends and himself.
Ray Fryberg was once a respected member of the Tulalip Tribes of Washington. Then his son, Jaylen, perpetrated the deadliest high school shooting in a decade.
U.S. has less than five percent of world's population, but had 31 percent of mass shootings in 1966-2012.
The morning shooting prompted a lockdown and evacuation of the Wayne Community College in Goldsboro, North Carolina, about 50 miles southeast of Raleigh.
Two years after the massacre, town officials voted to tear down Adam Lanza's house while a new school is in the works.
Dr. Peter Langman's new book, released Friday, focuses on understanding for the sake of prevention.
Parents of 11 victims file papers to create estates for their children, a necessary step before filing a wrongful-death suit.
A report released Friday presented a profile of the gunman and revealed the missed opportunities before Lanza embarked on his shooting spree.
Susan Klebold to write about her son's actions and her involvement in suicide prevention
"A gunman entered the high school this morning, shot one student," the Troutdale police chief said.
Columbine was not the first school shooting, nor was it the last, but it was nonetheless an event of extreme national trauma.