Long Island serial killer?
The Long Island Serial Killer (also referred to by media sources as the "Gilgo Killer") is an unidentified suspected serial killer
who is believed to have murdered 10 people associated with the sex
trade over the last 15 or so years and dumped their bodies along the Ocean Parkway, near the remote beach towns of Gilgo Beach and Oak Beach in Suffolk County and the area of Jones Beach State Park in Nassau County.
The remains of four victims were found in December 2010, while six more sets of remains were found in March and April 2011. Police believe that the latest sets of remains predate the four bodies found in December 2010. 
On May 9, 2011, authorities surmised that two of the newest sets of remains might be the work of a second killer.
On November 29, 2011, however, the police announced that they believe
that one person is responsible for all 10 deaths and that they do not
believe that the case of Shannan Gilbert (see below) is related.
According to Suffolk County District Attorney Thomas Spota, "It is
clear that the area in and around Gilgo Beach has been used to discard
human remains for some period of time." 
Identity of the Killer
There has been much speculation in the media concerning the identity
of the killer, currently known as "Unsub" - Unknown Subject.
Some profilers speculate that the killer could have ties to law
enforcement due to his sophisticated knowledge of police procedures.
Others believe that the murderer is an organized killer, with a
detailed knowledge of law enforcement techniques which have thus far
helped him avoid detection, and that he is a white male and very
familiar with the South Shore of Long Island.
Some have speculated that serial killer and former Long Island resident Joel Rifkin
may have been responsible for some of the older remains found in March
and April 2011, as four of his victims' bodies were never found. In an April 2011 prison interview with Newsday, Rifkin denied having anything to do with recently discovered remains. Experts and victims' rights advocates, however, believe that Rifkin's recent statements have no value.