Police have arrested a man they say killed his grandmother, then left her body outside an apartment building in Brooklyn.

The incident happened just before 2 a.m. Thursday.

Investigators say they found the body of 70-year-old Joyce Spears in front of the building on Union Street near Troy Avenue in Crown Heights. 

Police say 32-year-old Barry James hit her with a blunt object, then stabbed her. 

She was found wrapped in a bed sheet. 

Spears is now facing murder charges. 

A bloody knife and 35-pound weight were recovered from the scene.