The vegan activist suspected of shooting three people at YouTube’s California headquarters visited a local shooting range for practice just hours before the attack, police said.
Nasim Aghdam, a self-proclaimed vegan activist who published videos on the site, was found dead at the scene with a “self-inflicted wound” on Tuesday.
San Bruno police chief Ed Barberini said she legally owned the semi-automatic handgun which was used in the shooting.
Three people were taken to hospital with gunshot wounds. Two women were released on Tuesday night but a 36-year-old man remained in a serious condition.
Investigators do not believe Aghdam, 39, targeted anyone in particular.
She had criticised YouTube on her website and accused the video-sharing site of reducing the money she was able to make.
"Youtube filtered my channels to keep them from getting views!" one of the messages said.
"There is no equal growth opportunity on YOUTUBE or any other video sharing site, your channel will grow if they want to!!!!!"
Nasim Aghdam: YouTube California HQ Shooting - In pictures
Her father today said he had warned police she was upset with the company and might be planning to go to its offices.
Police disputed the father's statement, saying officers who talked to Aghdam before the attack said her family gave no warning she might commit violence.
She had told family members that she believed the company was suppressing her videos, which included segments about veganism, animal cruelty and exercise, along with glamour shots of herself.
People who post on YouTube can receive money from advertisements that accompany their videos, but the company "de-monetises" some channels for reasons including inappropriate material or having fewer than 1,000 subscribers.
Aghdam "hated" YouTube and was angry that the company stopped paying her for videos she posted, her father, Ismail Aghdam, told the Bay Area News Group.
On Monday, he called police to report his daughter missing after she did not answer the phone for two days and told officers she might go to YouTube, he said.
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Officers in Mountain View - about 30 miles from YouTube's headquarters - found her sleeping in her car in a car park at around 2am on Tuesday but let her go after she refused to answer their questions.
Aghdam did not appear to be a threat to herself or others, police spokeswoman Katie Nelson said.
