The verdicts were overturned after Quick withdrew his murder confessions and courts found the evidence that then remained to be insufficient.
But Krister van der Kvast, the prosecutor in all of Quick's murder trials, told newspaper Dagens Nyheter that even without confessions, the original verdicts are correct.
"I think he has been sentenced properly with proper evidence. Nothing new has come to light other than his retracted confessions. If one believes the evidence is insufficient, that should be tried in court," van der Kwast said.
Two more retrials are scheduled, and Quick has applied for a retrial in the remaining three cases.
"These things may happen in less developed countries, but it should not happen in Sweden. Nobody cared about those who opposed the process," the brother of Charles Zelmanovits said.