A mass murderer who cut off his own penis and carved '666' into his head has been sentenced to death.
Nikko Jenkins, 30, killed four people in Omaha, Nebraska back in 2013 but claimed he should get a more lenient sentence because his self-harm was evidence of psychosis.
However, psychiatrists have repeatedly testified that he is faking in an attempt to reduce the severity of his sentence.
In August 2013, just days after being released from 10 years in prison for two carjackings and two assaults, he went on a violent killing spree.
He shot and killed 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.
Eight days later, Jenkins and his sister killed Curtis Bradford, an acquaintance from prison.
He later pulled Andrea Kruger from an SUV as she drove home from work, before shooting her four times before driving off in her car.
Jenkins was described by one prison psychiatrist as a 'psychopath', and he showed no emotion as he was handed the death penalty sentence on Tuesday.
Judge Peter Bataillon gave the verdict for the panel, saying that they took into consideration Jenkins' violent history and his lack of remorse for his killings.
Andrea Kruger was one of his victims. Credit: Facebook
"Each one of the murders was a deliberate and planned attack," the judge said. "This was one of the worst killing sprees in the history of the state."
Douglas County Attorney Don Kleine added that the murders were horrific and there was no choice but to hand Jenkins the death penalty sentence."I think the law and the evidence supported the judge's decision," he said.
It's been 20 years since the last execution in Nebraska, when Robert Williams was put to death for killing two women in 1977.
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