A Sheepshead Bay man has confessed to killing and dismembering his roommate, prosecutors say.

According to authorities, Sergey Mamonov was arraigned on murder charges in the 61st Precinct after 55-year-old Aleksandr Zilbergleyt's body was found inside a refrigerator at their Nostrand Avenue apartment on Tuesday.

A criminal complaint says Mamonov told police that he beat Zilbergleyt to death during a fight on March 25 and then carved up his body.

Mamonov is being held without bail.