For almost eight hours Wednesday, ATF agents searched Aghdam's family Menifee home and the home in San Diego where Aghdam lived with her 90-year-old grandma.
Aghdam was intense, he said. However, during a conversation with a policeman, she rather calmly revealed that she had gotten into an argument with her family, which was the reason why she was sleeping in her vehicle and not at home in a bed.
"We were sitting in a meeting and then we heard people running because it was rumbling the floor". The brother described his sister as a "nice" and "innocent" person, "not today, but she never hurt any creature", he said.
The woman who shot three people at YouTube's headquarters was prolific at producing videos and posting them online, many of them weird, such as a clip in which she removes a revealing purple dress to expose fake, strapped-on breasts with the message "Don't Trust Your Eyes".
Aghdam had been reported missing Saturday in San Diego County. On Thursday evening, customers streamed in and out carrying rifle cases, and an assortment of shotguns and rifles for sale were on display behind the counter.
Additionally, her father, Ismail Aghdam, called Mountain View police and warned them that the shooter may be headed for YouTube.
In a video posted in January 2017, Nasim Aghdam says YouTube "discriminated and filtered" her content.
Still, she seemed to be a conflicted woman living in two worlds, the Iran of her childhood where she would attract numerous social media followers, and the United States where she became disillusioned over what she perceived as the hypocrisy of American ideals.
"She was insane and just wanted to make herself famous", she said.
YouTube spokeswoman Jessica Mason could not immediately be reached for comment. Ismail Aghdam said his daughter was not a terrorist and she was not violent.
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"At no point during our roughly 20 minute interaction with her did she mention anything about YouTube, if she was upset with them, or that she had planned to harm herself or others", police said in a statement.
They let her go, saying there was no indication she needed to be detained.
Police confirmed Tuesday that a woman believed to be a shooter opened fire at YouTube headquarters in San Bruno, California, wounding at least four people before apparently killing herself. But on Wednesday, San Bruno police Chief Ed Barberini said "we know (Aghdam) was upset with YouTube, and now we've determined that was the motive". "At this time there is no evidence that the shooter knew the victims of this shooting or that individuals were specifically targeted", police said in a statement. One spent magazine was found at the scene, along with the gun and the second loaded magazine, he said.
In 2014, Aghdam was the subject of a profile in "Peaceful Dumpling", a New York-based Vegan and sustainable lifestyle website. Her handgun had a 17-bullet capacity, according to Smith & Wesson.
Before going to the company's headquarters, she practiced with the weapon, which was registered in her name, at a nearby gun range.
Nasim Aghdam used the name "Nasime Sabz" online, a law enforcement official with knowledge of the investigation told The Associated Press.
Police say the videos posted by the woman who wounded three people in a shooting at YouTube headquarters are central to the motive.
As of right now, the three shooting victims were rushed to Zuckerberg San Francisco General Hospital.
In a screenshot of the email uploaded on June 27, 2017, Aghdam rails against "discrimination and hatred problems against me", complaining of a "huge drop in views" after she began uploading videos in Farsi and Turkish.