The Long Island serial killer (also referred to as LISK, the Gilgo Beach Killer, the Manorville Butcher, and the Craigslist Ripper) is an unidentified suspected serial killer who is believed to have murdered between 10 and 16 people over a period of nearly 20 years, and to have disposed of their bodies in areas on the South Shore of Long Island, New York. Most of the known victims were sex workers who advertised on Craigslist. The victims' remains were found over a period of months in 2010 and 2011, after the disappearance of Shannan Gilbert resulted in a police search of the area along the Ocean Parkway, near the remote beach towns of Gilgo and Oak Beach in Suffolk County. The remains of four victims designated "The Gilgo Four" were found within a quarter of a mile of each other near Gilgo Beach in December 2010. Six more sets of remains were found in March and April 2011 in Suffolk County and Nassau County. Police believe the latter sets of remains predate the four bodies found in December 2010.Gilbert's remains were found a year after the remains of "The Gilgo Four" were discovered. Her cause of death remains contested, with police claiming accidental drowning while an independent autopsy determined possible strangulation.