Cops yesterday arrested the accomplice of a burglar fatally shot by a Queens supermarket janitor, authorities said.

Alpha Diaby, 22, was charged with burglary for the failed heist that left Mamadou Koureichi, 27, dead.

Angel Candido, 54, was taking a nap at Met Foodmarkets on Jamaica Avenue when the two mens allegedly cut a hole in the roof and dropped down.