'Serial Killer' Once Called Howard Stern's Radio Show To Claim He'd Killed 12 Prostitutes

But one of his most sinister and quite upsetting moments came when he received a call from a man who claimed to have murdered 12 prostitutes.

Footage of the phone call has since been shared on YouTube and other channels, although the caller's claims have never been verified. You can watch it below:

WARNING: Clip contains strong language and graphic descriptions

During the conversation, Clay said that he chose to murder the women because of a 'sense of power' he gained from it.

He went on to say that he had planned on leaving clues for detectives at the crime scenes but there was no need.

"I wanted to baffle people, but it turned out that no one noticed for a long time," he told the host.

"I never sent the clues, I never left anything, you know, I wanted to add my little signature."

When asked about the timeline of his alleged murders, Clay told Stern and his producer Robin that he hadn't killed in almost a year.

And when the host asked if he planned on killing himself, Clay said: "If I killed myself, I'd miss the next Batman movie."

Chillingly, he then went on to explain why he hadn't murdered another woman in almost 12 months.

"I really don't know, Howard. Part of it had to do with my car broke down," Clay said.

"Well, that was the reason for a month, but after that, I guess it was all self-control."

Howard then asked him if he still wanted to kill women.

To which Clay replied: "Sure."

The very dark conversation continued with Howard and Robin asking Clay about whether he enjoyed the act of killing, and how he did it.

According to reports, the FBI turned up at the studio the day after the broadcast to get copies of the recording.

And while some believe the call was a hoax, no further information has been released on it.