The Los Angeles County Sheriff´s Department said that Nathaniel Tennosuke Berhow died at about 3:30pm Friday at a hospital with his mother present.
Berhow, who has been described as a loner, was caught on the surveillance cameras calmly retrieving a .45 semi-automatic rifle from his backpack at Saugus High School in Santa Clarita, California at around 7.30am on Thursday.
He then fired five shots, counting out each one, before turning the gun on himself to use up his last bullet in a failed suicide attempt, which left him in critical condition.
Though the entire shooting was caught on surveillance cameras inside the school, footage of the incident has not been released.
Two students – 14-year-old Dominic Blackwell and 16-year-old Gracie Muehlberger were killed. Another three students – Mia Page Tretta, another girl called Addison and a teenage boy who has not been named, were injured
Mia and Addison remain in the hospital but are expected to survive. The teenage boy was released from the hospital on Friday morning.  

He did say that authorities had recovered an additional six weapons in the suspect’s home, on top of guns that were registered to his late father, and the rifle he used in the attack.
Police have not yet revealed whether that gun was registered or not. It is being examined now in a crime lab.
Berhow gave no warning of what he was about to do, the sheriff said.
‘He was just standing by himself, at one point walked to the center of the quad, withdrew the firearm and just started firing,’ Villanueva said, adding that he looked ‘very familiar with a firearm’.
The three who were injured were able to run from the scene and take refuge in classrooms until help arrived. 

‘He was just standing by himself, at one point walked to the center of the quad, withdrew the firearm and just started firing,’ Villanueva said, adding that he looked ‘very familiar with a firearm’.
The three who were injured were able to run from the scene and take refuge in classrooms until help arrived.  The three – Gracie, Dominic and Berhow were all lying in the middle of the quad when the first officer – an off-duty cop who happened to be dropping off his girlfriend’s son when the shooting began – appeared at the scene.
Santa Clarita detective Daniel Finn was the first to rush into the building after hearing gunfire as he dropped his children off at school.


He appeared at the press conference to describe running towards the three kids, unaware of which one was the shooter or whether or not there was still a threat.
‘I was on my way to work and dropping off my girlfriend’s son at school, as I passed the school I saw maybe several hundred running off campus.
‘I drove in, asked a student what was going on. He said there were gunshots so I notified the sheriff’s station then I started to enter campus at which point I was joined by off-duty Inglewood police officer,’  Finn said.
He said that by the time he got to the quad, there were ‘no students’ around.
‘The vast majority either exited or had been safely secured. As I came around to the quad area, I saw three of the victims laying on the ground,’ he added.
Detective Finn said he did not know or think to investigate which of the students was the shooter.
He also was not immediately thinking about his girlfriend’s son, he said.

LA County Sheriff Alex Villanueva appeared at a press conference on Friday to give an update on the Saugus High School shooting