Xu Mi, a 67-year-old resident of San Francisco, was found dead on June 1, 2013. The San Francisco Police Department listed the death as a homicide and has kept the investigation open. Rewards have been offered for information leading to an arrest, and the department’s Homicide Detail has asked the public for tips.

The case is described as unresolved and is counted among the city’s cold cases, with investigators noting difficulties in many similar incidents when witnesses or substantial evidence are lacking. Authorities say they continue to pursue leads and hope new forensic advances or community information will produce a breakthrough.

If anyone knew Xu Mi, witnessed anything in San Francisco around June 1, 2013, or has information that could help, please contact the San Francisco Police Department’s Homicide Detail.