Amazon founder and multi-billionaire Jeff Bezos is mourning the loss of his mother, Jackie Bezos, who died after a long battle with dementia.

Jackie Bezos, a fierce protector of her son Jeff before he founded Amazon.com and a deep-pocketed advocate for early childhood education, has died. She was 78.

Jacklyn Gise Bezos, the mother of Amazon founder Jeff Bezos, has died at 78 after a five-year struggle with Lewy body dementia, a progressive brain disorder. Along with her husband Miguel, she was the first to invest in Amazon.