Well-known crypto tech executive Bob Lee was stabbed to death early Tuesday morning near downtown San Francisco.

The 43-year-old Lee was perhaps best known for starting Cash App, and as former CTO of Square. He was the chief product officer of San Francisco-based crypto startup MobileCoin.

"Our dear friend and colleague, Bob Lee passed away yesterday at the age of 43, survived by a loving family and collection of close friends and collaborators," reads a statement from MobileCoin, which described him as "a dynamo, a force of nature ... the genuine article."

“Bob would give you the shirt off his back,” his father said in a Facebook post.

“He would never look down on anyone and adhered to a strict no-judgment philosophy.”

San Francisco police responded at around 2:35 a.m. to a report of a stabbing in the city's relatively safe Rincon Hill neighborhood, where they found Lee still alive.

He was taken to a local hospital where he succumbed to his injuries, CBS News reports.

No arrests have been made in the case, nor has any information on potential suspects been released.