Police identified the woman in Tuesday's shooting as San Diego resident Nasim Najafi Aghdam, who was in her late 30s.
The most seriously wounded victim, a 36-year-old man initially classified as critically injured, was upgraded to fair condition Thursday.
According to ABC News, the Mountain View Police Department has confirmed that they found a woman identified as Nasim Najafi Aghdam asleep in her vehicle in a parking lot in that city on Tuesday morning. She was virtually unknown in a country where about 40 million people use the app.
Aghdam's online profile shows she was a vegan activist who ran a website called NasimeSabz.com, meaning "Green Breeze" in Persian, where she posted about Persian culture and veganism, as well as long passages critical of YouTube.
In one video posted under her online name Nasime Sabz, she can be heard complaining that "YouTube filtered my channels to keep them from getting views!"
YouTube had no immediate comment about any actions related to Aghdam's videos.
The woman who wounded three in a shooting at YouTube headquarters had a tiny social media presence in her native Iran, where her death was reported briefly by state television.
KGO-TV reported the shooter was believed to be a white woman wearing a headscarf and a dark top, but police did not immediately confirm it. Witnesses told KTVU that the suspect shot her boyfriend before killing herself.
Hossein Naderi, a 23-year-old art student, questioned why Aghdam chose to "live in the US though she didn't like it there". But police officials said the 38-year-old appeared calm in a 20-minute conversation with officers after they found her sleeping in her auto, and neither she nor her family mentioned she was a danger to herself or others when they notified the family after speaking with her. Nor did she give any indication she was a threat to herself, the news service said.
The brother told him there's a reason that she went all the way from San Diego to where they found her.
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Ismail Aghdam told the Bay Area News Group that he warned police his daughter, Nasim Aghdam, might be going to YouTube because she "hated" the company.
So he called police to say "she went all the way from San Diego, so she might do something". According to the New York Post, Aghdam might also have been angry that YT had censored one of her workout video tutorials for being too provocative.
There was a time several years ago, however, when she seemed to be enjoying the fruits of her free speech.
But once again, police said, "At no point did her father or brother mention anything about potential acts of violence or a possibility of Aghdam lashing out as a result of her issues with her (YouTube) videos".
Officials said Aghdam did nothing to suggest she was a danger to herself or others when they found her asleep in a Walmart parking lot the next day. "If I had to pick neighbors, I'd have them all around". According to the police, their officers had looked up and talked to her family after finding her sleeping in her auto.
"So they didn't do anything, and she got killed", her brother said.
The woman, who was 39 years old, is believed to have carried out the attack because of a domestic dispute, officials said.
- The family of Nasim Aghdam appear confused by the shooting rampage and are trying to come to terms with it.
"Our family is in absolute shock", he wrote, "and can't make sense of what happened yesterday". Some neighbors revealed how she didn't leave her home often, and the outlet mentions Aghdam's apparent website, which reportedly contained a manifesto full of grievances against YouTube regarding censorship and demonetization of her content.
The gunfire started shortly before 1 p.m.at the company's headquarters about 10 miles from San Francisco.