A tech consultant was convicted on Tuesday of second-degree murder in the death of Bob Lee, the wealthy founder of Cash App who was killed last year in a slaying that inflamed tensions over the safety of San Francisco streets after the pandemic.

The consultant, Nima Momeni, 40, avoided first-degree murder charges but faces a sentence of 15 years to life in prison for the killing.

In the early morning hours of April 4, 2023, the police found Mr. Lee bleeding profusely in a doorway on an otherwise empty street in downtown San Francisco, not far from Oracle Park, where the Giants play baseball. He had been stabbed in the hip and heart, and he had called 911 begging for help. He died soon after at a nearby hospital.

Mr. Lee, 43, was a well-known tech executive in San Francisco and Silicon Valley. He had been a founder of the digital wallet service Cash App in 2013, and at the time of his death, he was the chief product officer of the cryptocurrency start-up MobileCoin.

He had recently moved to Miami but was back in San Francisco for a visit and was partying that night in a condo in the Millennium Tower, a skyscraper known for its wealthy residents and worrisome tilt.