A decomposed body dumped on Long Island in the 1980s has finally been identified as a long-missing 15-year-old girl whose remains were likely moved from another grave, police said Thursday.

Susan Mann disappeared in Queens on May 17, 1980, with her remains found in a Freeport dumpster more than two years later, yet her identity remained a mystery until now — with cops still trying to solve the grisly cold-case murder, police said at a press conference. 3

“We never give up,” Nassau County Police Detective Capt. Stephen Fitzpatrick told reporters. “There are no cold cases. Only open cases.

“This technology has been extraordinary,” Fitzpatrick said of the high-tech DNA testing that led to the break in the case. “This is just another positive identification utilizing the advances in DN

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