The board noted Ng has demonstrated a positive attitude and work ethic in prison.
Co-defendants Kwan Fai "Willie" Mak and Benjamin Ng were convicted of aggravated murder and are serving life sentences without chance of parole. Tony Ng is no relation to Benjamin Ng.
Unlike his co-defendants, Ng was not convicted of murder but was convicted on 13 counts of first-degree robbery and a single count of assault. Sentencing rules in place at the time allowed a state parole board to determine when Ng was fit for release.
Tony Ng was charged in the murders, but claimed he had been forced to participate in the massacre by Mak. While prosecutors now say the jury shouldn't have heard that defense, jurors found in Ng's favor and convicted him only of robbery.
"The Wah-Mee massacre stands as the worst mass murder in Seattle history," King County Prosecuting Attorney Dan Satterberg said in a statement, "and it seems incomprehensible that one of the participants will soon be free."
"There is little doubt that Tony Ng caught some breaks in his favor that he did not deserve, but the verdict of the jury set in motion the possibility of his eventual release," Satterberg concluded.