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Keith Jesperson, the "Happy Face" serial killer who has been trading prison letters with Gilgo Beach killer Rex Heuermann, is warning that the hulking former architect could face a reality check when he's shipped upstate this month.
"The problem with Rex is his size — he thinks prison will be a cake walk because of how big his ego is," Jesperson, 71, wrote in a text message to podcaster Keith Rovere. "[I] had to tell him the little guys work out too, to beat up us big guys. He will have some fights, even in protective custody."
The message was shared with Fox News Digital. In it, Jesperson warned that Heuermann, 62, might even be "tossed to the wolves" by prison guards at some point.
"Keith is almost 7 feet tall, and he took a couple beatings," Rovere told Fox News Digital Thursday. "It's a numbers game in prison, no matter how big you are."
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Rex Heuermann in his latest mugshot, dated July 25, 2025 at the Suffolk County Jail in Riverhead, New York. (Suffolk County Sheriff's Office)
Heuermann remains in custody at the Suffolk County Jail in Riverhead, New York. He will be moved to a state prison after his formal sentencing on June 17.
When asked if he thinks Heuermann may have more victims, Jesperson, who admitted to killing eight himself, declined to answer.
"What l think isn't important," he wrote in a message to Fox News Digital. "We just have to wait and see on the 17th."
Dubbed the "Happy Face Killer" for drawings he included in letters to the media, Jesperson said he'd rekindled a correspondence with Heuermann after the latter pleaded guilty , something Jesperson had urged him to do for years.
"He basically has told me thank you for letting him know about the process in the system dealing with [serial killer] cases," Jesperson told Fox News Digital.
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Rex A. Heuermann pleads guilty to murdering seven women and admits to an eighth killing during a hearing in Suffolk County Court in Riverhead, N.Y., on April 8, 2026. (James Carbone/Newsday via Pool)
Writing from a prison in Oregon, Jesperson said Heuermann would've had nothing to gain by taking his case to trial given the evidence against him — which includes transferred hair DNA from his then-wife and daughter on some of the victims.
Heuermann's ex-wife, Asa Ellerup, said through her attorney Thursday that she would not be attending his sentencing.
"Ms. Ellerup believes this day should be centered on the victims, their families, and the profound impact these crimes have had on their lives," her attorney, Bob Macedonio, told Fox News Digital. "Out of respect for those who have endured unimaginable loss and suffering, she does not wish her presence to distract from the purpose of these proceedings. Her thoughts remain with the victims and their loved ones as they continue their pursuit of justice, healing, and closure."
Suffolk County District Attorney Ray Tierney has said investigators do not believe the family was involved in Heuermann's crimes.
"Probably why he pleaded guilty and avoid the trials ," Jesperson wrote. "Told him nothing to gain in the trials and everything to lose. Suggested him not to make a statement to the court at sentencing; however, his lawyers might be pushing him to."
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Keith Jesperson stands in court in Vancouver, Wash., as Don Findlay, son of murder victim Julie Ann Winningham, addresses him before sentencing on Dec. 19, 1995. Jesperson, known as the "Happy Face Killer," was sentenced to the maximum 34 years after already receiving two life terms in Oregon for other murders. (Jeremiah Coughlan/The Columbian/AP)
Jesperson first reached out to Heuermann within a week of his arrest in July 2023. Since then, he's sent almost 40 more letters, according to a source close to the family.
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"Rex, in New York , has had my letters telling him to deal out to better his placement inside," Jesperson told Fox News Digital in January. "Yet he is letting it play out."
Early on, Heuermann responded just once in a handwritten note that was later shared with Fox News Digital, but Jesperson now says he has received more replies after changing his plea in April.
Keith Jesperson appears in a Clark County Sheriff's office booking photo. Multnomah County District Attorney Michael Schrunk asked a Salem, Ore., judge on Oct. 26, 1995, to order the immediate release of two people convicted of murdering a Portland, Ore., woman, citing Jesperson's confession as evidence they were wrongfully accused. (AP Photo)
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Jesperson first shared Heuermann's initial reply with "The Lighter Side of True Crime " podcast host Rovere, who provided a copy…
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