The monster who killed and chopped up 8-year-old Leiby Kletzy more than a decade ago — in one of the Big Apple’s most infamous child abduction and murder cases — died behind bars, The Post has learned.

Levi Aron, 49, died shortly before 10:30 a.m. Wednesday at a hospital near Wende Correctional Facility in Erie County, state correction officials confirmed.

The twisted killer was serving 40 years to life for little Leiby’s brutal 2011 murder.

Aron admitted that he abducted the boy just blocks from his Borough Park home on July 11, 2011, took him to a wedding in Rockland County then returned home to learn a massive search was underway for the missing child.

Panicked, he drugged the youngster, smothered him with a towel, chopped up his body and dumped the remains, Brooklyn prosecutors sai

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