Susan Wojcicki on how she created YouTube as the new TV

Last year, she stepped down from her role after more than two decades leading various parts of Google and parent company Alphabet.

“Even as I write this, it seems impossible to be true,” Alphabet CEO Sundar Pichai wrote in a memo to employees Friday that was posted on the company’s website.

“Her loss is devastating to all of us who knew and loved her, to the thousands of Googlers she led over the years, and to the millions of people around the world who admired, supported and led her them and felt the impact of the incredible things he created at Google, YouTube and beyond.”

Wojcicki has been a key figure at Google since the company’s early days, when he rented his Palo Alto garage to founders Larry Page and Sergey Brin.

In 2016, Wojcicki spoke at Of luck The Most Powerful Women Summit with creator Grace Helbig and Of luck Jennifer Reingold on the evolution of media, the creator economy and her vision for YouTube as the future of TV.

Read Fortune Susan Wojcicki’s obituary here.