NYPD detectives are investigating the death of an unidentified woman found unconscious on a Brooklyn street early Saturday. Cops were called to the corner of Flatlands and Van Siclen Aves. in East New York at about 4:30 a.m. after the woman was found sprawled out on the sidewalk. The woman died at the scene. Cops were still trying to identify her Saturday. An autopsy has been slated to determine how she died, an NYPD spokesman said.