Derek Hall, 30, was fatally shot late at night on February 14, 2012, in San Francisco’s Bayview district. Police found him critically injured after responding to reports of gunfire; he was pronounced dead at the scene. The killing occurred amid a period of rising violence in Bayview that contributed to a significant increase in the city’s homicide rate that year.

Investigators say the case remains unsolved and that a shortage of witnesses has hindered progress. The San Francisco Police Department is still seeking information, and tips that lead to an arrest could qualify for rewards of between $50,000 and $250,000.

If anyone knew Derek or has information about that night in Bayview, please contact the San Francisco Police Department with any details that might help the investigation.