Authorities said that the suspect, a student at the high school in Santa Clarita, north of Los Angeles, carried out the attack on his 16th birthday.
Los Angeles authorities said Friday that 16-year-old Nathan Berhow succumbed to his injuries following a self-inflicted gunshot wound. The shooting, captured on surveillance video, took 16 seconds. All Hart District schools in Santa Clarita were closed on Friday, the Santa Clarita Valley Sheriff's office said on Twitter, out of respect for the victims and their families. He was standing by himself, walked to the quad area, dropped his backpack and started firing, striking random targets, Villanueva said.
In a statement, Bryan and Cindy Muehlberger said they shared the news of their daughter's death with "unexplainable brokenness".
Coincidentally, Lawrence directs emergency medicine at Henry Mayo Newhall Hospital, where four students shot at Saugus High were treated.
Two students, 15-year-old Grace Anne Muehlberger and 14-year-old Dominic Blackwell, died at a hospital.
His father had been a hunter and possessed firearms, and there were other firearms found in his home, Villanueva said.
The Los Angeles County coroner's office identified the victims on Friday as 14-year-old Dominic Blackwell and 15-year-old Gracie Muehlberger. He began firing, cleared the jammed weapon and kept shooting.
"We did not find any manifesto, any diary that spelled it out, any suicide note or any writings", he said.
Villanueva noted that three off-duty law enforcement officers - one with the sheriff's department and officers from Inglewood and Los Angeles - were the first people on scene because they have relatives who attend the school.
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After more than 40 interviews, police still don't know what prompted him to commit such a crime, said Captain Kent Wegener of the department's homicide unit.
According to Lawrence's daughter Cambria, the idea for "Keep the Pressure" came right about the time she was entering high school.
Kenino said investigators are trying to determine the origin of the.45 semi-automatic pistol used in the shooting. After shooting his five classmates, Berhow shot himself in the head with the last bullet.
Officials have identified one of the two students were killed in a school shooting in Southern California.
Randazzo says that what pushes most shooters is some loss or disappointment, often recent, followed by the inability to cope with a feeling of being overwhelmed.
A cross-country teammate of the gunman said he was shocked the teen could be capable of such a violent act.
Though police have not found a motive for Berhow's attack, they do believe it was premeditated.