Scant details emerge on fatal stabbing of Cash App founder amid safety concerns

Details of how the tech executive Bob Lee came to be fatally stabbed in downtown San Francisco remained scant on Friday, as those who knew the Cash App founder mourn his death and others voiced frustration with public safety.

San Francisco police found Lee, 43, on the sidewalk in front of a condominium building with stab wounds shortly after 2.35am on Tuesday. He was taken to a hospital, where he died. Details about the attack remain thin; surveillance footage released this week reportedly shows Lee stumbling along a sidewalk and seeking help in the aftermath, but police have not confirmed the circumstances of the attack or arrested a suspect.

Sgt Adam Lobsinger of San Francisco police said in a video message on Thursday that the investigation was still in its early stages and the department would not comment on evidence or speculate on circumstances.

Lee is known for creating the widely used mobile payment service Cash App while working as chief technology officer of the payment company Square, now known as Block. He was the chief product officer for the cryptocurrency firm MobileCoin at the time of his death. He leaves behind two children.

Lee was also generous with his time coaching and championing fellow engineers and entrepreneurs, said Wesley Chan, co-founder of FPV Ventures. The two met more than a decade ago when they both worked at Google, where Lee helped to build the Android smartphone operating system before its 2008 release.

The Associated Press contributed reporting