Nathan Berhow, the 16-year-old student who is accused of killing two of his classmates, was pronounced dead Friday afternoon, officials say, CBSLA reports.
Kenino said investigators are trying to determine the origin of the.45 semi-automatic pistol used in the shooting.
School records show Berhow was a keen middle-distance track runner.
Dr. Bud Lawrence and his two daughters have supplied emergency kits to high schools in Santa Clarita through a related nonprofit they formed called "Keep the Pressure".
As of late Friday, it was still unclear if the campuses would reopen Monday.
In a statement, Bryan and Cindy Muehlberger said they shared the news of their daughter's death with "unexplainable brokenness".
Messages on Muehlberger's Instagram page read "I miss you so much already love" and "It's so sad that another innocent person has to die". A 14-year-old boy was treated and released from another hospital, authorities said.
The Los Angeles County coroner's office says 14-year-old Dominic Blackwell died Thursday along with 15-year-old Gracie Muehlberger. Doctors performed surgery and were able to remove the bullet, officials said.
The three injured students are in a stable condition.
"A remarkable experience, being with 14-, 15-year-old survivors, that are consoling you, not the other way around, " Newsom told Fox11. And some cared for victims who had been shot by a fellow student. It was his 16th birthday. The entire shooting took 16 seconds, Wegener said. The handgun was recovered at the scene - all of its bullets having been fired. Finn said he saw the shooter's gun but wasn't aware one of the people being treated was the gunman.
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"It wasn't a spur of the moment act", Villanueva said. He was standing by himself, walked to the quad area, dropped his backpack and started firing, striking random targets, Villanueva said.
Authorities said that there was no other suspect and no known ideology behind the attack.
Authorities also said that no diary, manifesto, or suicide note had been found.
"We know it was a planned attack", he said Friday.
After learning the gunman's name by interviewing eyewitnesses and reviewing the surveillance video, deputies went to Berhow's family's home in the 22900 block of Sycamore Creek Drive and conducted an initial search to ensure there were no additional victims there, but none were found. "Some of these firearms were not registered at all".
Friends said Berhow could be introverted but he had a girlfriend and a good social network focused on his cross-country teammates.
Berhow's father was an avid hunter who died two years ago.
Investigators are digging into the suspect's social media and background, he said.
A community vigil is being planned at 7 p.m. Sunday at Santa Clarita's Central Park.