ORLANDO, Fla. -

A Winter Garden man convicted in the Christmas Eve 1975 murders of his wife, his in-laws and a fourth victim, has once again been denied an effort to test DNA on evidence that helped put him on death row.

Tommy Zeigler’s 37-year fight for vindication appears to be nearing its end, as the Florida Supreme Court on Thursday ruled it had already decided that the DNA evidence – even if it shows what Zeigler claims it does -- would not have likely led to his acquittal.

The court ruled 6-0 that Zeigler is using “variations of the same arguments he made in his previous motion for DNA testing in 2001” and, since the court had already denied those claims, he is barred from asking again for essentially the same relief.

Zeigler, 67, remains on death row at Union Correctional Institution.

Investigators claim he shot himself after murdering his three family members and a man who happened into the store, part of a scheme to obtain life insurance proceeds.