Jeff Chiu/AP Photo.
- Authorities are investigating what they called the "murder" of Cash App founder Bob Lee.
- The SFPD chief said Thursday there are "good developments" in the investigation, per ABC's KGO-TV.
- But the city's District Attorney said "this is one that's going to take time to solve," per the report.
San Francisco's law enforcement officials said they are still investigating the death of Cash App founder Bob Lee, amid news reports of surveillance videos that appeared to show him seeking help after the attack.