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In this July 31, 2014 file photo, John Bittrolff, right, listens to his attorney William Keahon during his arraignment on murder charges in Riverhead, N.Y. Suffolk County Assistant District Attorney Robert Biancavilla said Tuesday, Sept. 12, 2017 that Bittrolff, convicted of killing two prostitutes in the 1990s may be responsible for at least one of the 10 unsolved killings of people along a Long Island beach highway. (Photo: James Carbone/Newsday via AP, Pool, File)

A killer who was found guilty of killing two women in the 1990s could be tied to at least one of the victims at the infamous Gilgo Beach dumping site on Long Island, according to a prosecutor.

John Bittrolff, 51, was arrested through the use of familial DNA in 2014 on charges of murder in the deaths of Rita Tangredi and Colleen McNamee. Convicted in July of the second-degree counts, today he was sentenced to consecutive sentences totaling 50 years behind bars.

But some of the 11 victims found beginning in 2010 along Gilgo Beach “may be attributed to the handiwork of Mr. Bittrolff,” according to Robert Biancavilla, a Suffolk County Assistant District Attorney, who spoke after today’s sentencing.

The Gilgo site is the main crime scene associated with the so-called “Long Island Serial Killer,” or LISK, as the unknown criminal has been dubbed by the press.

Biancavilla made the assertion about Bittrolff in response to questions from reporters. But the Suffolk County DA’s office would not comment further—except to say the investigation is ongoing.

Tangerdi, 31 at the time of her death, was in a wooded area off of Esplanade Drive in East Patchogue, on Nov. 3, 1993. McNamee, then 20, was found nearly three months later, on Jan. 30, 1994 in a wooded area south of the Long Island Expressway in North Shirley. Both bodies were discovered naked and partially mutilated, and both had been strangled and suffered blunt force injuries to their heads. Both women had been working as prostitutes at the time of their deaths.

Bittrolff was discovered through semen found on the victim. The DNA sample on those two bodies was later searched for partial matches in a database (a "moderate stringency partial match.") Bittrolff’s brother was arrested in 2013 for criminal contempt charges, which turned up a partial match, according to The New York Times.

One other brother was eliminated as a suspect through a comparison of DNA left on a cigarette butt, according to The Times. But John Bittrolff took a sip of water while being questioned by authorities—and the saliva left on the surface matched the killer of the two.

Bittrolff is also suspected in a third woman’s death, 28-year-old Sandra Costilla, whose remains were found in North Sea in November 1993.

Whether Bittrolff is connected to the bodies on Gilgo remains to be seen. The sites of the graves are spread between different jurisdictions—and the criminal dubbed the Long Island Serial Killer dismembered the bodies of victims, so that body parts were found at different times in far-flung locations.

The Associated Press contributed to this report

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