Authorities say 20-year-old Ebony Young was stabbed near the doorway of the deli on 1076 Broadway in Bushwick around 4 p.m.
Police say the victim and another woman got into a loud argument outside, so loud, in fact, that one of the businesses across the street closed and locked its doors.
The female suspect reportedly fled eastbound on Broadway in a gray BMW driven by a man.
Young was taken to Woodhull Hospital, where she later died.
It is unknown whether the two women knew each other, or what they were arguing about.
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