The students slain by Berhow were identified as Gracie Anne Muehlberger, 15, and a 14-year-old boy.
A 16-year-old Saugus High School student who walked into the campus quad and shot five classmates, two of them fatally, then turned the gun on himself died today at a hospital.
Investigators say they have no motive yet for the 16-second attack that ended with the boy firing a final bullet into his own head.
Doctors said Friday morning that two girls, ages 14 and 15, who were both shot in the torso, were doing well and should be released from the hospital over the weekend.
Coincidentally, Lawrence directs emergency medicine at Henry Mayo Newhall Hospital, where four students shot at Saugus High were treated.
In a statement, Bryan and Cindy Muehlberger said they shared the news of their daughter's death with "unexplainable brokenness".
"Reassuring to the community to the students that they can be safe in a school setting", Martinez said.
"You have the image of a loner, someone who is socially awkward, doesn't get along, some violent tendencies, dark, brooding and online odd postings - stuff like that", Los Angeles County Sheriff Alex Villanueva said.
The victims - a boy and a girl died while another three students were wounded - appeared to have been chosen at random, he said.
"It wasn't a spur-of-the-moment act", Villanueva said.
His father had been a hunter and possessed firearms, and there were other firearms found in his home, Villanueva said.
His proficiency with the weapon during his short, deadly ambush suggested he had been firing guns for some time.
Officials said Friday that they have interviewed more than 40 people but have not found writing from Berhow that could shed light on his thinking before the attack.
Villanueva says the boy entered the school grounds, went by himself into a quad, dropped his backpack, pulled out the handgun and fired methodically but randomly. "He's a cookie cutter kid that you could find anywhere".
Deputy James Callahan, a school resource officer at Saugus High, was one of the first to arrive at the scene of the shooting Thursday.
Friends said Berhow could be introverted but he had a girlfriend and a good social network focused on his cross-country teammates.
The stereotype of the loser sociopath is often inaccurate, according to the psychologist who co-wrote federal guidelines for assessing school shooting threats.
Most shooters she studied were academically successful and weren't social outcasts.
Since the shooting, authorities have accumulated more information on the alleged shooter.
The suspect died a day after the attack of a self-inflicted gun-shot, two students have died from the attack.