In the early hours of February 19, 1983, Henning G. Chinn, 52, was one of thirteen people shot to death inside the Wah Mee Club, a private gambling room in Seattle’s International District. The killings were carried out during a robbery by three men who were known to some patrons. The assailants entered armed and systematically shot occupants; Chinn and twelve others died of gunshot wounds.

Police quickly identified Kwan Fai Willie Mak, Benjamin Ng, and Wai Chiu Tony Ng as the suspects. Mak and Benjamin Ng were arrested soon after; Tony Ng fled to Canada and was later captured in Calgary. A single survivor provided key testimony used at trial. Mak and Benjamin Ng were convicted of murder and received life sentences; Tony Ng was convicted on multiple counts relating to robbery and assault.

Did anyone who knew Henning or who frequented the Wah Mee Club in 1983 see something that could still help explain how the crime unfolded?