EXCLUSIVE: THE SICK ‘KILLER CIRCLE’ REVEALED: Inside the twisted pen-pal friendship between Gilgo Beach monster Rex Heuermann and the notorious ‘Happy Face Killer’ as sheriff exposes the depraved world of ‘fan mail’ behind bars

Rex Heuermann admitted on Wednesday that he strangled eight sex workers to death since 1993.

The dark, damp walls of the Suffolk County jail hold many secrets, but none are more stomach-churning than the contents of the mailbag arriving for the “Massapequa Park Monster,” Rex Heuermann.

In a chilling revelation that has sent shockwaves through the families of his victims, it has been exposed that the 62-year-old serial killer—who recently confessed to the brutal strangulations of eight women—is not as alone as he seems. While the hulking architect lives in “voluntary isolation,” shunned by society and kept away from the general prison population, he has found a “sick” brotherhood among the nation’s most depraved psychopaths.

Suffolk County Sheriff Errol Toulon has officially pulled back the curtain on Heuermann’s twisted new social life, revealing a network of “notorious” pen pals reaching out from across the country to connect with the Long Island butcher.

“Happ Face Killer” Keith Jesperson is one of Rex Heuermann’s serial killer pen plans, according to a report.

A Meeting of Malice

Among the stack of envelopes arriving at the Riverhead lockup, one name stands out with terrifying prominence: Keith Jesperson, the infamous “Happy Face Killer.”

Jesperson, who is currently serving multiple life sentences for the murders of at least eight women in the early 1990s, has reportedly been mentoring Heuermann from his cell in the West. It is a connection forged in blood and perversion—two predators sharing tips on how to navigate a life behind bars that they earned through the most “brutal and perverse” of desires.

Insiders suggest the letters are more than just casual correspondence; they represent a “criminal underworld” of mutual admiration. Jesperson, known for his arrogance and desire for the limelight, reportedly advised the 6-foot-4 architect to skip the “circus” of a trial.

Suffolk County Sheriff Errol Toulon said Rex Heuermann is getting fan mail from other serial killers.Brigitte Stelzer for NY Post

“He was done,” Jesperson allegedly boasted about his advice to Heuermann. “I told him that his best way forward was to make a deal to plead guilty in exchange for a better place to do his life—what life he has left.”

It appears the Gilgo Beach killer listened. On Wednesday, Heuermann finally admitted to the decade-spanning killing spree that turned the scenic South Shore into a graveyard, pleading guilty to the murders of eight sex workers whose lives he extinguished since 1993.

Rex Heuermann is being held at the Suffolk County jail in Riverhead after pleading guilty to eight cold-case killings.Suffolk County Sheriffs Office

‘The Oozing Loner’

Despite his high-profile “friends” in high-security places, Heuermann’s daily existence is a pathetic shadow of his former life as a Manhattan professional. Sheriff Toulon described a man who has become a “schlub” behind bars, characterized more by his physical decay than his former imposing presence.

Sources say Heuermann is suffering from a “weight-related” medical issue involving an “oozing” foot problem, a grotesque detail that mirrors the internal rot of a man who spent thirty years leading a double life.

Life in the ‘Heuermann Bubble’:

• Total Lockdown: Whenever Heuermann leaves his cell, all movement in the entire jail ceases.

• Zero Interaction: He has no friends and receives no “love letters” from the public—only correspondence from fellow killers.

• Religious Solace: The monster has reportedly turned to the Catholic faith, with services brought directly to his cell.

• Commissary Comforts: He has reportedly been “putting on weight,” ballooning in size by gorging on snacks from the jailhouse store rather than eating the standard inmate fare.

Public Outrage and the ‘Fan Mail’ Phenomenon

The eight women killed by Rex Heuermann on Long Island between 1993 and 2010.Suffolk County Police Department

The revelation that these “psychopaths” are allowed to communicate has sparked a firestorm of public outrage. While the law prohibits jail officials from reading the specific content of the letters, the names on the return addresses provide a horrifying map of the American serial killer landscape.

“We’re not allowed to read these letters, but we can see the incoming correspondence on the envelope,” Sheriff Toulon admitted.

For the families of the “Gilgo Four” and the other victims—Melissa Barthelemy, Megan Waterman, Amber Lynn Costello, and others—the idea of Heuermann receiving “fan mail” from a fellow predator like Jesperson is a final, bitter insult. It paints a picture of a “sick” club where the entry fee is the lives of innocent women.

The Final Chapter

As Heuermann prepares for his sentencing in June, where he faces three consecutive life terms without the possibility of parole, he remains a man obsessed with his own survival and comfort.

He spends his hour of “freedom” walking laps around the prison yard—thirty laps to a mile—trying to move his massive frame while his “oozing” foot serves as a constant reminder of his physical decline. He does not play basketball; he does not use the machines. He simply walks, a lone predator in a cage, waiting for the next letter from the “Happy Face Killer” to arrive in the mail.

The architect who designed a life of secrets has finally been exposed, and his only remaining audience is the very monsters he once tried so hard to hide his connection to.