The seven women and five men decided that the defendant, Ronell Wilson, should die.
Two other defendants died, one was acquitted and three cases were dismissed.
In eight cases, the defendants had died before their trials and judicial proceedings were stopped.
"The defendant did not quit and they continued to OD and die."
While that court initiated one genocide trial, the defendant died this summer, before the case could be completed.
One defendant died during the trial and the charges against him were dropped.
Two other defendants have died and two are awaiting trial.
The fourth defendant, Mark Hernandez, died in 1987 after brain surgery unrelated to the killing, prosecutors said.
Two cases are pending, and one defendant died.
The last surviving defendant died in 1989.