The agency said the student, a junior at Saugus High School in Santa Clarita, died just after 3:30 p.m. PT (6:30 ET). His mother was present when he died, according to a Los Angeles Sheriff's Department statement.
The attack killed 15-year-old Gracie Muehlberger and 14-year-old Dominic Blackwell.
Grace Anne Muehlberger, 15, and Dominic Blackwell, 14, died at the hospital, authorities said.
"Her parents, Cynthia and Brian, [are] obviously devastated", Villanueva told KNBC.
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".
The boy, Nathaniel Tennosuke Berhow, died on Friday afternoon after he shot the others the previous morning.
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"Kudos to all of them for a job well done and, hopefully, that's a job we never have to do again", Villanueva said Friday. "And, being shot in the torso is a big deal". "Student athlete", Los Angeles County Sheriff Alex Villanueva told CNN "New Day".
Berhow carried out the 16-second gun attack shortly before classes began on Thursday which coincided with his 16th birthday.
"These are acts of suicide as much as homicide", she said.
Investigator Carlos Kenino of the Alcohol, Tobacco & Firearms department said all six of the firearms owned by the shooter's late father had been accounted for and none had been used in the shooting.
A motive in the mass shooting has not been determined by investigators. The boy was carrying out a deliberate plan when he shot five students at his California high school, then turned the gun on himself, a local sheriff said on Friday, but authorities said they had no clues about what sparked the bloodshed.
According to Lawrence's daughter Cambria, the idea for "Keep the Pressure" came right about the time she was entering high school.
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The consequences of the high school shooting in Santa Clarita will continue to have an effect on the community long after the camera crews are gone, and for the students who knew the suspect as a friend, they are having trouble understanding the attack.
The names of the wounded students were not released.
Martinez said for students who knew the suspect, it is common for them to have feelings of regret or guilt for not noticing a red flag before the attack.
When asked why she did this, the unnamed neighbor said, "I wanted to show the mother that somebody cares".
Officials have identified one of the two students were killed in a school shooting in Southern California.
Friends said Berhow could be introverted but he had a girlfriend and a good social network focused on his cross-country teammates. Police recovered several firearms during a search of the teen's home - some were not registered.
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