Frederick Marcelo, 36, was killed in San Francisco on July 13, 2008. The case is unsolved and has been hampered by a lack of witnesses and limited evidence, leaving it an active cold case.

Authorities have urged the public to come forward with information and have offered rewards for tips; the San Francisco Police Department has used monetary incentives in other unsolved homicide investigations, ranging from $50,000 to $250,000, to encourage leads that could lead to an arrest and prosecution. Marcelo’s murder remains on the city’s list of unsolved violent crimes and underscores the difficulties investigators face in closing cases without community cooperation.

If anyone has information about Frederick Marcelo or that night in July 2008, please contact the San Francisco Police Department.