Mystery as Cash App founder and tech executive stabbed to death in San Francisco in savage attack

Bob Lee, 43, died from his injuries following the horror attack that happened early on Tuesday morning in the Rincon Hill neighborhood.

Lee founded CashApp and was the chief product officer at the cryptocurrency company MobileCoin.

The tech guru, who was also known as Crazy Bob, was previously a chief technology officer at Square and also worked as a Google software engineer.

Lee also worked on the development of the core libraries for Android.