‘Hit harder’: The disturbing notes accused Gilgo killer Rex Heuermann kept about alleged murders

Accused Gilgo Beach serial killer Rex Heuermann kept a stomach-churning “planning document” mapping out his grisly slayings — which even included a chilling “things to remember” section and morbid “lessons learned” section, officials revealed.

A computer “allocated space” file that Heuermann allegedly tried to delete laid out a gruesome road map to the vicious murders of six sex workers dating to 1993 — including the decapitation and dismemberment of two killings newly tied to the hulking Long Island dad, Suffolk County prosecutors said Thursday.

In one disturbing notation, Heuermann allegedly indicated he planned to keep killing, prosecutors said.

“The GIlgo Homicide Task Force members believe these references to ‘next time’ indicate Heuermann’s prior experience and what changes to implement moving forward,” the DA’s filing said.

Prosecutors said accused serial killer Rex Heuermann, at right with his lawyer, Michael Brown, kept a sick ‘planning document’ of the slayings. James Carbone / Newsday
Rex Heuermann is now charged with killing six sex workers on Long Island over the past three decades.

The revelation came as the DA’s office slapped Heuermann with new charges in the 1993 slaying and dismemberment of Sandra Costilla and Jessica Taylor in 2003 — on top of the pending felony charges he already faced in the deaths of the women known as the “Gilgo Four.”

According to a bail application filed by prosecutors Thursday, Heuermann maintained a secret digital record titled “HK2002-2004” on his computer since at least 2000, keeping precise notes on the murders.

The digital document was broken up into specific sections like “problems,” “supplies” and “TGR,” which prosecutors said are believed to be potential targets, and “DS,” allegedly for “dump sites.”

The sick how-to file notes that “small is good” for potential victims, and includes a three-part section for “pre-prep,” “prep” and “post-event,” the Suffolk DA’s court document said.

“The HK planning document continues to further expound on preparatory measures such as specific “recon” steps taken,” including “packaging [a body] for transport,” prosecutors said.

One section notes to, “remove head and hands,” which the DA’s office said is consistent with the remains of Taylor and another Gilgo body, Valerie Mack, which has not been officially tied to Heuermann.

Also included is a section reminding the accused killer to “remove ID marks [tatoos] (sic),” which is consistent with Taylor’s remains, which had “linear injuries,” particularly “around where Ms. Taylor’s tattoo had been located, which investigators believe was intended to inhibit the identification” of the victim.

A bail application filed Thursday by Suffolk County prosecutors reveals Rex Heuermann’s sick computer planning document. Suffolk County District Attorney

Finally, Heuermann allegedly kept a “things to remember” section, which detailed twisted reminders such as to “hit harder” for “next time” and to use heavier rope because the “light rope broke under [stress of being tightened.”

“Hit harder too many hit to take down,” the planning document says, according to prosecutors.

“Consider a hit to the face or neck next time for take down.”

In addition, Heuermann opines on the importance of sleep to avoid “problems” and increase what he refers to as “play time,” prosecutors said.

Also in that section are notations to “push pins to hang drop clothes from ceiling” and “not tape,” and notes on “sound travel” — indicating a preference for committing crimes indoors, the DA said.

According to prosecutors, the HK file “points to Heuermanns self-education and ‘homework.’”

Heuermann, a 60-year-old architect from Massapequa Park with offices in Midtown Manhattan, is now charged with killing a half dozen sex workers over the past three decades.

Rex Heuermann was hit with two new murder charges Thursday in the deaths of Sandra Costilla, left, and Jessica Taylor.

The murders of the victims — Taylor, 20; Megan Waterman, 22; Melissa Barthelemy, 24; Maureen Brainard-Barnes, 25; Amber Lynn Costello, 27; and Costilla, 28 — remained unsolved for decades until the slayings were reopened in 2022 and left to Heuermann’s arrest in July.

Costilla, who disappeared in 1993, had not previously been tied to the other bodies found along Ocean Parkway, where six other bodies were found and remain unsolved.

Costilla was initially believed to be tied to convicted serial killer John Bittrolff, but the documents filed Thursday by prosecutors said her DNA did not match him.

You May Also Like

Trump admin freezing $510 million in federal funding to Brown University 

The Trump administration plans to freeze more than half a billion dollars in federal…

'Widely respected' former federal MP Petro Georgiou dies aged 77

Former federal Liberal MP Petro Georgiou, a member of the Howard government,…

Australian shares take $35 billion hit as Trump tariffs spook markets

Australian shares took a $35 billion pounding in early trading today, following…

Donald Trump demands France ‘Free Marine Le Pen’ and brands her presidential election ban a ‘witch hunt’

President Donald Trump has offered his support to French far-right leader Marine…