The 12-day hunt for evidence involved ripping up the yard and the discovery of a basement vault containing hundreds of weapons kept by the man accused of killing at least three women more than a decade ago.
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Two sex workers currently in Suffolk County Jail had prior contact with Heuermann and have audio recordings of him, according to the sheriff's office.
The two interacted with him through various social media platforms.
"He had reached out to them for sex," Suffolk County Sheriff Errol Toulon said. "They had took the calls but fortunately, they did not meet with him."
Investigators are also talking to other sex workers in Suffolk County Jail, seeking anyone else who interacted with Heuermann in the past. That could expand to jails in neighboring counties and beyond.
Once Heuermann was identified as a suspect in the Gilgo Beach deaths, the Suffolk County Sheriff's office shared his distinctive physical description with inmates they knew were involved in sex trafficking. They could not share a photo of him at that time, due to the sensitivity of the investigation.
They also went through Heuermann's phone records, and realized the two sex workers serving time in the jail had previously been contacted by him. They were interviewed and provided the audio recordings.
After Heuermann was arrested, members of the jail's human trafficking unit were then cleared to show his photo to current inmates to see if any of them had contact with him. They are also reaching out to sex trafficking victims no longer in custody.