Joseph Williams, 74, was found dead by a family member in Williams' apartment on the 2900 block of Folsom Street at about 4:50 p.m. Thursday, according to police.
The medical examiner's office has since ruled Williams' death a homicide.
Since the Williams' death, a suspect has been accessing his bank account in San Francisco and around the Bay Area, police said.
The suspect has been described as a black man about 50 to 60 years old with medium complexion and a thin build. He is about 5 feet 3 inches to 5 feet 5 inches, according to police.
The man has been seen driving a gold or beige sedan, possibly a Mercedes E class with a sunroof.
Anyone with information is encouraged to call the San Francisco police anonymous tip line at (415) 775-4444 or send a text message to TIP411.
