Bob Lee, founder of Cash App and the former chief technology officer of Square, died Tuesday in San Francisco.

The San Francisco Chronicle and other outlets reported 43-year-old Lee died after being fatally stabbed early Tuesday morning, citing unnamed sources and police.

MobileCoin, a cryptocurrency and digital payments startup where Lee had been serving as chief product officer since 2021, issued a statement confirming Lee’s death without naming a cause.

“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,” said Josh Goldbard, CEO of MobileCoin. “Bob was a dynamo, a force of nature. Bob was the genuine article.”

The San Francisco Police Department did not immediately respond to a request for comment.

The department said in a Tuesday evening statement that officers responded earlier that morning to a report of a stabbing and found a 43-year-old male victim, who was taken to a hospital and succumbed to his injuries there. The report did not identify the victim and stated that no arrests have been made in the case.