Nasim Aghdam's family have spoken out following her attack on YouTube's headquarters.
The vegan video blogger walked into the company's campus in San Bruno, California with a 9mm handgun on Tuesday (local time) and opened fire.
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She injured three people and then killed herself.
In a statement given to reporters by Aghdam's father, the family says it has been left "in absolute shock" following her actions.
"Our family... can't make sense of what has happened," they said.
"Although no words can describe our deep pain for this tragedy, our family would like to express their utmost regret, sorry for what has happened to innocent victims.
"Our thoughts and prayers are with them and their families. We are praying for speedy recovery of the injured and ask God to bestow patience upon all persons hurt in this horrific senseless act."
Aghdam was said to be angered by YouTube removing ad revenue from her channel, which included bizarre videos of her working out and animal cruelty.
Her family contacted police before the attack, but officers say there was not enough evidence of danger.
"Her father called us back to let us know that she made a series of vegan videos for her channel on YouTube, and that the company had recently done something to her videos that had caused her to become upset," Mountain View Police said.
"Once again, 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 videos.
"They remained calm throughout this second phone call."