The settlement brought to about $700 million the total that more than 100 original defendants have agreed to pay to the plaintiffs in the trial.
Twenty-five of the 27 original defendants were finally convicted.
Most of the original 23 defendants in the case have pleaded guilty to reduced charges.
Two other men among the original 15 defendants have had their cases severed.
Only one of the original defendants remains in local law enforcement.
As of 2012, three of the original defendants in the case had died.
Lawyers for the original five defendants have demanded their exonerations.
In the course of the proceedings, 14 of the original 475 defendants were removed from the case and 10 died.
Another man has since confessed to the murder and implicated a friend, but the original defendants remain in prison.
One of the 40 original defendants committed suicide in jail.