A man and a woman were found dead inside an apartment at Flushing and Onderdonk avenues in Ridgewood late Monday.
Police have not identified a motive.
The victims have been identified as 21-year-old Franco Montoya and 28-year-old Beatrice Morris.
They were both found unresponsive with severe head trauma and were pronounced dead at the scene.
Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS (8477).