The man dubbed the “Chuck E. Cheese” killer has been denied a chance to avoid the death penalty once again, meaning an execution date is imminent.

The Colorado Supreme Court rejected Nathan Dunlap’s appeal, which was based on a lack of evidence regarding his mental state being introduced in his 1993 trial. Dunlap, who was 19 at the time, walked into a Chuck E. Cheese restaurant and shot four of his former co-workers to death; he also shot a fifth employee, who survived and later named Dunlap as the shooter. Dunlap was convicted of first-degree murder, attempted murder, robbery, theft and burglary and has made several attempts to have his death sentence overturned. According to attorneys, this was his last chance.

An execution date can’t come soon enough for the families of the slain; Bob Crowell, whose 19-year old daughter Sylvia was one of the victims, said he just wanted to see it come to an end after so many years.

“It left a big hole in our family, of course,” he said. “And 13 1/2 years is way longer than the process should take. Slow justice is no justice. Don’t get me wrong. I am not a violent type guy. I just think the public deserves justice.”