A New York architect who is already charged with four murders has now been charged with two more deaths.
Rex Heuermann, 60, appeared in court accused of killing Jessica Taylor in 2003 and Sandra Costilla in 1993.
Prosecutors cited DNA evidence and a “blueprint” of the suspected serial killer’s alleged crimes found on a computer.
Since 2010, police have been investigating a string of at least 10 deaths on Gilgo Beach, Long Island.
On Thursday, Mr Heuermann pleaded not guilty to the latest charges.
Officials discovered a document they believe the suspect used to plan the crimes.
It included columns labelled “problems” and “supplies”. Under the “problems” column, “DNA”, “tire marks” and “blood stains” were among items listed.
Terms like “booties” and “police scanner” were under the “supplies” column, according to the indictment.
Police believe two other columns in the file labelled “DS” and “TRG” stood for “dump site” and “targets”.
The document included a section labelled “pre-prep”, “prep”, and “post event”.
Suffolk County District Attorney Raymond Tierney said on Thursday that investigators had discovered the Microsoft Word document on a laptop.
An attempt had been made to erase the document, which was created in 2000, he said.
Mr Heuermann has been held without bail since he was arrested last July outside his Manhattan architecture office.
He was initially charged with the murders of three women, Melissa Barthelemy, Megan Waterman and Amber Costello.
Investigators filed new charges against him in January for the murder of a fourth woman, Maureen Brainard-Barnes.
The remains of the four women, believed to be sex workers, were discovered near Gilgo Beach in 2010.
Investigators seized hundreds of electronic devices from Mr Heuermann’s home that they believe he used to communicate with the women.
They also found nearly 300 guns in his home after his arrest.
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