About 11 hours after her conversation with police, Aghdam opened fire at YouTube Headquarters, wounding three before turning the gun on herself.
Aghdam's family reported her missing after she left her grandmother's house in San Diego "due to family issues".
Aghdam continued to discuss her family situation as she tried to find her ID. She was also not listed on the Armed and Prohibited Persons System, which cross-references records of persons who lawfully purchased handguns and/or registered assault weapons with records of persons who have become prohibited from owning and possessing firearms, the department said.
Mountain View police said they waited to release the video so that San Bruno police, who are the lead agency in the YouTube shooting, could view it first.
San Bruno city officials provided this photo of Nasim Aghdam on April 3, 2018.
She answers - "Yes, I've left my family..."
She told police she came to Mountain View to start a new life, away from San Diego.
She added that she had not told anyone where she went. They ask her if she was on any medication and Aghdam shook her head no.
The officers then called Aghdam's father and told him she had been located and that she didn't want to go back to San Diego.
Aghdam posted videos under the online name Nasime Sabz, and saw herself as a rising YouTube star who touted a vegan diet and rallied behind animal rights..
He communicated the interaction with the father and when he understood the two hung up.
"Based on our officers' interaction with Aghdam, including the fact that she had answered all of our questions cooperatively and thoroughly, there was no legal reason for us to remain on scene questioning her", the statement said. He thanked them but later called to say that Aghdam was upset about YouTube and may have been in the area for that reason.
Scripps station KGTV in San Diego talked with Aghdam's family at their home in Menifee the evening of April 3.
The Brisbane woman, who creates bangles with inspirational quotes engraved in them, said in the YouTube video they had planned to collaborate.
But she grew increasingly angry in recent months and decried YouTube's policies, saying the company was trying to "suppress" content creators.
We are getting a first look at the Mountain View Police Department's encounter with the YouTube shooting suspect the morning of the attack.
In a statement, Mountain View Police Chief Max Bosel said that his officers followed proper protocol. "The tragedy of the incident at YouTube weighs heavily on our hearts but we support and stand by the actions taken by our officers in their contact with Ms. Aghdam".