Wai Ming Ng was 56 when he was fatally attacked and stabbed on October 11, 2014, in San Francisco’s Bayview District. He worked for a local hardware company and was found by authorities with critical injuries; he died shortly afterward despite attempts to save him.

The case went cold because of a lack of witnesses and promising leads. His death was one of several homicides that underscored safety concerns in parts of the city. The San Francisco Police Department, with support from the Mayor’s Office, has offered significant rewards for information that could lead to an arrest and continues to ask anyone with information to come forward to help bring justice for Ng’s family and loved ones.

If anyone knew Ng, witnessed the attack, or has information that could help investigators, please contact the San Francisco Police Department.