The 43-year-old founder was involved in the fatal stabbing early Tuesday morning.

He was taken to a hospital with life-threatening injuries and later died, police said.

San Francisco police have yet to identify a suspect in this case, and no arrests have been made in the ongoing investigation.

San Francisco officials have been criticised for their response to a wave of violent crime in recent years.

About Bob Lee:

He was the founder of Cash App – a smartphone-based payment app that allows person-to-person money transfers and is now worth $40bn (£32bn), according to Forbes.

Since launching in 2013, its user base has skyrocketed, hitting seven million monthly active users in 2017, and climbing to 30 million in 2020.

He was the former chief technology officer of Square.

He had been serving as the chief product officer of the cryptocurrency company MobileCoin.

Lee’s LinkedIn profile says he was an investor in Musk’s SpaceX venture as well as other tech firms such as the social audio app Clubhouse.

He also assisted the World Health Organization with a Covid-19 mobile app and helped lead development of an at-home Covid testing company, according to a news release about his hiring at MobileCoin.

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