New York serial killer suspect kept ‘blueprint’ of crimes on computer, prosecutors say

The New York architect accused of murdering multiple women and leaving their corpses scattered along the Long Island coast kept a “blueprint” of his crimes on his computer, prosecutors revealed on Thursday, as they brought charges against Rex Heuermann over two more killings.

In a court filing, prosecutors said they were able to use new forensic testing methods to match hairs found on or near the vicinity of both victims to a DNA profile that is a likely match to Heuermann. Additionally, prosecutors say they recovered a file on a hard drive in his basement used to “methodically blueprint” his killings.

Tierney also acknowledged that the “blueprint” document, which Heuermann had attempted to delete, was a “significant impetus” for the renewed search across Long Island in recent weeks, as it was recovered in March from the more than 350 electronic devices seized from the suspect’s home. Those victims disappeared over a span of at least 14 years. Vexed detectives made only halting progress in identifying possible suspects. Investigators have long said it was likely that not all of the deaths were the work of the same killer. Some of the victims vanished in the mid-1990s. Investigators concluded that an 11th person who disappeared in 2010 from the barrier island community of Oak Beach had accidentally drowned.

Tierney said the planning document was recovered in March, providing the impetus for the recent searches.Prosecutors also said they found a book in Heuermann’s possession by the retired FBI agent John Douglas,. They say the planning document referenced specific pages in another work by Douglas,, that allude to the personality types of serial killers and profiles of those who use mutilation and sexual violence.

Valerie Mack, 24, who had been working as an escort in Philadelphia, disappeared in 2000 and was last seen by her family in Port Republic, New Jersey, near Atlantic City. Some of her skeletal remains were discovered that year in the Manorville woods. More of her remains were found in 2011 during the search around Gilgo Beach.

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