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A woman is set to marry a serial killer, who sliced off his own penis, on death row after he killed four people on a 10-day shooting spree in Nebraska.

Dawn Arguello fell in love Nikko Jenkins while volunteering for an inmate advocacy group as he waits to be executed.

Back in 2015, Jenkins tried to make his penis look like the ancient god Apophis, which looks like a giant snake, but his self-mutilation went wrong.

Just weeks before he had attempted to carve 666 onto his own forehead, but forgot he was looking in the mirror and scraped 999 instead.

The convicted murderer also tried to slice his tongue like a snake and smeared the blood all over his cell walls.

(Image: Facebook)

The killer says he acts under the voice commands of a serpent god, but psychiatrists are split on whether is he a genuine schizophrenic.

Ms Arguello does not appear to put off by Jenkins' history, however she is annoyed he has had her name tattooed on his face.

She told Obama World-Herald: "He's not what the media has made him out to be.

"He's an enigma. He has feelings. He's very sensitive. He's very intelligent and, yes, he's very manipulating."

In August 2013, Jenkins went on a killing spree, shooting and killing Juan Uribe-Pena and Jorge Cajiga-Ruizon using a sawn-off 12-gauge shotgun.

Their bodies were found inside a pickup truck in southeast Omaha, New York Daily News reports.

This happened merely days after he was released from a 10 year prison sentence for two carjackings and two assaults.

Eight days later, Jenkins killed Curtis Bradford, a man he knew from prison.

And he later shot Andrea Kruger four times before taking off in her car.

Jenkins was convicted of four counts of first-degree murder after he killed four people over 10 days.