POISON PEN PALS

Gilgo monster gets advice from Happy Face Killer!

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Jesperson wrote to Heuermann at his prison in Riverhead, N.Y., and Heuermann wrote back, according to the sheriff who oversees the jail

COLD-BLOODED creep Rex Heuermann — who’s admitted to killing at least eight women as part of the Gilgo Beach killings in Long Island — has another notorious butcher as a pen pal!

Just as chilling, the vile monster spends hours behind bars reading violent crime novels involving serial killers.

Heuermann, 62, reached out to Keith Hunter Jesperson, the infamous Happy Face Killer, who confessed to killing eight women across the country in the 1990s, says Suffolk County Sheriff Errol Toulon.

Jesperson, who’s serving multiple life sentences without the possibility of parole in Oregon, wrote to Heuermann at the prison in Riverhead, N.Y., where he’s being held with words of prison wisdom.