A 15-year-old missing Queens girl whose body was finally identified more than 40 years after it was found is believed to have been murdered and buried in the ground a couple of years before her corpse was tossed into a Long Island dumpster , police said Thursday.

The long-unidentified Jane Doe who turned out to be Susan Mann disappeared from her Hollis home in May of 1980. Her body was found in November 1982 in a Freeport dumpster but not identified until recently.

Her body was exhumed — again — this time by investigators collecting her DNA and clues that eventually led to her identification.

”Our investigation believes that she was moved, that she was possibly buried … and then moved to this location in ‘82,” said Capt. Stephen Fitzpatrick, commander of the Nassau County Police De

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