Cash App creator and former Square CTO Bob Lee has died after a reported stabbing in San Francisco

• Bob Lee died after a stabbing on Tuesday morning, NBC Bay Area reports.
• He created Cash App while working as Square's CTO, before moving on to MobileCoin.

The creator of Cash App and former CTO of Square, Bob Lee, was fatally stabbed in San Francisco early Tuesday morning, according to an NBC Bay Area report.

In a statement posted online, the San Francisco Police Department said it responded to a report of a stabbing around 2:35 a.m. on Tuesday without naming the victim. Unnamed sources later confirmed Lee's identity to NBC Bay Area.

"The victim was transported to a local hospital with life-threatening injuries," the police department said. "Despite efforts by first responders and medical personnel, the victim succumbed to his injuries."

Lee joined Square, the fintech company founded by Jack Dorsey, as its first chief technology officer in 2010. It was there that he created Cash App, the mobile payment app which rivals Venmo. A spokesperson for Square did not immediately respond to Insider's request for comment outside of business hours.

In 2021, he became the chief product officer of MobileCoin, another fintech company that focuses on privacy by using end-to-end encryption.

"Bob was a force of nature," MobileCoin CEO Joshua Goldbard told Insider. "He helped to birth Android and CashApp into our world. Moby was his dream: a privacy-protecting wallet for the 21st century. I will miss him every day."

Silicon Valley executives shared their grief and condolences on Twitter after his death was reported Tuesday night.

Figma CEO Dylan Field said: "We remained connected over the years and he was an early supporter of Figma. It's so hard to believe he is gone."

And the founder of news site TechCrunch, Michael Arrington, described him as "one of the best humans I've ever met."

"I'm so glad we were able to spend time together recently. RIP," he added.