Nikko Jenkins

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Nikko Jenkins (front right) who was convicted of killing four people in and around Omaha, Nebraska, in 2013, was sentenced to death by a three-judge panel in 2017. Jenkins wants the Supreme Court to review his sentence. (Associated Press)

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FILE - In this April 16, 2014 file photo, Nikko Jenkins is led to court by a Douglas County deputy in Omaha, Neb. Jenkins, convicted of killing four people in and around Omaha in 2013, has been sentenced to execution or life in prison. A three-judge panel will announce on Tuesday, May 30, 2017, whether Jenkins is sentenced to death or to life in prison. Jenkins' sentencing has been delayed several times because of questions about his competency. (AP Photo/Nati Harnik, File)

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FILE - In this file photo from April 16, 2014, Nikko Jenkins is led by a Douglas County deputy in Omaha, Neb. A special committee of Nebraska lawmakers will begin its investigation Friday, May 16, 2014, into the Department of Correctional Services' handling of the Nikko Jenkins case. Jenkins pleaded guilty last month to killing four people after he was released from prison, despite allegations that state officials knew he was still dangerous. (AP Photo/Nati Harnik, FILE)

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Nikko Jenkins, charged with four counts of first-degree murder in the slayings of four Omaha people last summer, is led from court by Douglas County deputies in Omaha, Neb., Wednesday, April 16, 2014. Jenkins was found guilty on all charges. (AP Photo/Nati Harnik)

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Nikko Jenkins, charged with four counts of first-degree murder in the slayings of four Omaha people last summer, is led from court by Douglas County deputies in Omaha, Neb., Wednesday, April 16, 2014. Jenkins was found guilty on all charges. (AP Photo/Nati Harnik)

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Nikko Jenkins, charged with four counts of first-degree murder in the slayings of four Omaha people last summer, is led to court by a Douglas County deputy in Omaha, Neb., Wednesday, April 16, 2014. Jenkins was found guilty on all charges. (AP Photo/Nati Harnik)

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Nikko Jenkins is led by deputies at the Douglas County Courthouse in Omaha, Neb., Wednesday, Feb. 12, 2014. Jenkins, charged with killing four people in the weeks after he was released from prison last summer, appeared in court for a hearing to determine if he is competent to stand trial. (AP Photo/Nati Harnik)

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