Tech mogul Bob Lee fatally stabbed in San Francisco, bystanders reportedly failed to help.

Bob Lee, the founder of Cash App and former CTO of Square, was stabbed to death in a random mugging in San Francisco. The incident occurred early on Tuesday morning, and no arrests have been made. Lee was in San Francisco to attend a MobileCoin leadership summit and had remained in the city to see friends when he was attacked. The incident has raised concerns about rising crime in San Francisco, and surveillance footage shows onlookers ignoring Lee's plea for help as he stumbled down the street bleeding heavily from stab wounds.