An Amityville couple admitted Tuesday to killing and dismembering two housemates in a case that shocked the community after teenagers discovered a body part near a Babylon park and officials found more remains scattered across Long Island last year.

Jeffrey Mackey, 40, will be sentenced to 22 years in state prison for second-degree murder under a plea agreement that considered his eligibility for a sentence reduction as a victim of domestic violence at the hands of the victims, officials said.

Mackey’s girlfriend, Alexis Nieves, 35, will serve 11 years behind bars for manslaughter under a separate agreement detailed before Suffolk Supreme Court Justice John Collins in Riverhead.

Mackey admitted stabbing Malcom Craig Brown, 53, in the neck inside the Railroad Avenue home they shared shor

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