The victim was identified as Edwin Echevarria, a 65-year-old man from the Lower East Side — and his alleged killer is his 23-year-old roommate, police said.

The human remains found in a suitcase floating in the East River have been identified as Edwin Echevarria, 65, who was allegedly murdered by 23-year-old Christian Miller.

The NYPD has arrested the roommate of a man whose dismembered body was found floating inside a suitcase in the East River last week—after the two had been fighting about food, sources said.