Sundar Pichai CEO of Google and Alphabet in a tribute posted on X adds

“Unbeluevably saddened by loss of my dear friend after two year of living with cancer. She is core of historo of Google as anyone its hard to imagine the world without her. Pichai continued. She was incredible person, friend and leader who had a termendous impact on the world and I m one of countless Googlers who is better for knowing her We will miss her dearly. Our thoughts with her family RIP Susan”

she stepped down as CEO of YouTube in February 2023.