He was 43 years old.
The tech mogul, who formerly served as the chief technology officer of Square, was attacked in the city’s downtown Rincon Hill neighborhood at 2:35 a.m., according to San Francisco police.
Officers arrived to find a 43-year-old man, later confirmed to be Lee by CBS News, with multiple stab wounds.
Lee was taken to a nearby hospital, where he succumbed to his injuries, police told the outlet.
No arrests have been made as of early Wednesday.
San Francisco police have not released any suspect details, the outlet added.
The Post has reached out to the San Francisco Police Department for comment.
Lee had served as the chief product officer of San Francisco-based cryptocurrency company MobileCoin since November 2021, according to his LinkedIn page.
Tributes from his co-workers began to pour in Tuesday night, with MobileCoin CEO Joshua Goldbard calling Lee “a force of nature.”
“Bob was a force of nature. Helped to birth Android and CashApp into our world,” Goldbard told ABC7.
“Moby was his dream: a privacy-protecting wallet for the 21st Century. I will miss him every day.”
During his tech career, Lee also worked at Google, where he led Android’s core library team and launched the world’s most-used operating system, according to his profile on MobileCoin’s official website.
Later, Lee founded the social network Present, and went on to invest in companies like Figma, Clubhouse, Beeper, and Faire.
When the COVID-19 pandemic hit the globe, Lee assisted the World Health Organization with its mobile app and later helped to develop an at-home testing company.