Hung Pham, 46, was shot and killed while sitting in his car in San Francisco’s Sunset District on October 13, 2008. His death was ruled a homicide and the San Francisco Police Department opened an immediate investigation, but investigators were hampered by a lack of witnesses and insufficient evidence.

The case is now listed as a cold case after investigators exhausted leads and no new witnesses have come forward. Authorities have repeatedly appealed to the public for information and have offered significant rewards for tips that could lead to an arrest and prosecution. Pham’s killing is one of several unsolved homicides tied to a period of rising gun violence in the city.

Anyone with information is urged to contact the San Francisco Police Department anonymously so that new details might help bring resolution to this case.