Amazon founder and former CEO Jeff Bezos is showing his softer side following the death of his beloved mother, Jackie Bezos, who passed away this week at the age of 78. While the famed tech visionary did not share her exact cause of death, he revealed in a heartfelt post that she had endured “a long fight with Lewy Body Dementia.”

Gise raised Jeff as a single mom, meeting Cuban immigrant Miguel Bezos, now 79, while she was going to night school and working during the day at a bank, said the tribute. They were married in 1968, with Bezos adopting her young son.

Jacklyn ‘Jackie’ Bezos, mother of Amazon founder Jeff, has died aged 78, after a five year battle with progressive neurological disorder Lewy body Dementia. The billionaire shared a heartfelt tribute on Instagram on Thursday after the news was confirmed in a statement from the Bezos Family Foundation.