By Bridget Murphy, Associated Press

BOSTON (AP) — The family of a deceased man suspected of being the Boston Strangler is outraged police secretly followed his nephew to collect DNA for new tests.

Read: Boston Strangler Timeline

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Attorney Elaine Sharp says Albert DeSalvo’s family also believes there’s still reasonable doubt he killed the Strangler’s last supposed victim, even if additional DNA tests show a 100 percent match.

Authorities said Thursday new tests led them to conclude DeSalvo is a 99.9 percent match to DNA found on Mary Sullivan’s body.

They’ve obtained a court order to exhume his body for further testing.

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Sharp says private tests show other male DNA was present that didn’t match DeSalvo.

But authorities say their evidence was preserved in a lab, while evidence used in private testing was questionable.

DeSalvo confessed to the killings but recanted before dying in prison in 1973.

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Copyright 2013 The Associated Press.