A bloodthirsty Brooklyn murderer who hacked up his former roommate and drug dealer, then stored the man’s body parts in his fridge, will spend the rest of his life behind bars — and a new court filing offered a harrowing blow-by-blow description of the horrific crime.

Nicholas McGee, 48, turned his Flatbush apartment into a grotesque scene that would give a grindhouse B-movie director pause when he killed 39-year-old Kawsheen Gelzer in a seedy dispute over sex, drugs and disrespect in March 2022.

A Brooklyn Supreme Court jury convicted McGee of first-degree murder last month. On Wednesday, Justice John Hecht sentenced him to life without parole.

McGee and his wife, Heather Stines, lived in the apartment on Nostrand Ave. near Farragut Road in East Flatbush, and Gelzer and others d

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