Update 4 p.m.: San Francisco Police say they have arrested 66-year-old Robert Graves of San Francisco on suspicion of murder.
Original story 6:45 a.m.: The medical examiner identified the man who was shot to death over the weekend as 24-year-old Geofrey Greer.
On Saturday at about 2:30 a.m., police were called to an apartment building on the 1100 block of Pacific Avenue on reports of a shooting. When they arrived, they found Greer with gunshot wounds.
Police didn't have much information about the incident, but said that Greer had a "dispute" with a 55-year-old man right before the shooting .
The 55-year-old man is in police custody, however, authorities have not identified him at this time.
Anyone with information about this incident is asked to contact the anonymous tip line at 575-4444 or Text-a-Tip to TIP41 and begin the text message with SFPD.