Echoing the popular TV show Showtime, Dexter, in which a cop leads a double life as a serial killer, New York cops think the serial killer who has murdered at least four women may be a former or current law enforcement official, the New York Times reports.

Investigators say that the killer shows a high understanding of police operations, from contacting the four prostitutes who have fallen victim to him with disposable cell phones, to making calls to a victim’s home from crowded parts of New York City, where the killer would blend in on surveillance footage, even if his phone signal was pinpointed.

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Over three days, police found the bodies of four women in burlap sacks along the same underbrush-covered beachside strip in Long Island. They believe all are victims of the same killer.

Creative Commons image via flickr user Ed Yourdon.