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Updated

Editor's note: This story contains some graphic details. 

Gilgo Beach murders suspect Rex Heuermann made thousands of explicit Google searches for child pornography and other disturbing media, according to law enforcement officials.

Rex Heuermann is charged with six counts of murder: one count of first degree murder and one count of second degree murder for each of the three victims. Those victims have been identified as Melissa Barthelemy, Megan Waterman, and Amber Costello. 

Heuermann has pleaded not guilty to all counts.

Officials detailed in a bail application that Heuermann made "thousands" of Google searches for various explicit pornography and also searched for nearby sex workers. Fox News Digital is not describing many of the Google searches due to their explicit nature.

INFAMOUS LONG ISLAND SERIAL KILLER SUSPECT BEHIND GILGO BEACH MURDERS IN CUSTODY: OFFICIALS

Rex Heuermann in New York City

Rex Heuermann, 59, is tied to at least 11 murders after New York authorities discovered 11 sets of human remains strewn along a suburban Long Island beach highway between 2010 and 2011. (Jeffrey Simon Architecture & Design)

Among the Google searches that Heuermann allegedly made are "mistress long island" and "mature escorts Manhattan."

Many of the Google searches allegedly involved child pornography.

Law enforcement officials obtained the Google search history through a warrant on a "junk" and "burner" email account. 

Alleged Gilgo Beach serial killer led into court

Rex Heuermann is led into Arthur M. Cromarty Criminal Complex in Riverhead, NY on Friday, July 14, 2023. The 59 year old is being charged with three counts of murder in relation to the deaths of victims found on Gilgo Beach. (Matt Agudo/Splash for Fox News Digital)

According to the bail application, the email address was found after Google was issued a warrant seeking records or accounts associated with burner phones obtained by Heuermann.

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Between March 2022 and June 2023, according to the bail application, the suspect allegedly made over 200 Google searches related to the disappearances and murders of Maureen Brainard-Barnes, Barthelemy, Waterman, and Costello.

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Google searches

Google searches allegedly made by Heuermann. (Suffolk County DA)

The Google searches include "why could law enforcement not trace the calls made by the long island serial killer," "why hasn’t the long island serial killer been caught," "In Long Island serial killer investigation, new phone technology may be key to break in case," and more.

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Rex Heuermann used fictitious names and online accounts to solicit and arrange sexual activity, according to a bail application.

Rex Heuermann used fictitious names and online accounts to solicit and arrange sexual activity, according to a bail application. (Suffolk County DA)

Heuermann searched for a number of documentaries and podcasts relating to the investigation, and viewed related articles as well.

Fox News' Greg Norman and Michael Ruiz contributed to this report.