In 2014, Little was sentenced to three consecutive terms of life in prison without parole for the beating and strangulation murders of Carol Alford, 41, Audrey Nelson, 35, and 46-year-old Guadalupe Apodaca.
Those three victims, all women, were beaten and strangled.
The man who has been dubbed the most prolific serial killer in American history has been filmed laughing as he casually described murdering one of his 93 victims..
Little, who often went by the name Samuel McDowell, grew up with his grandmother in Lorain, Ohio.
He was arrested in 2012 and extradited to California on a narcotics charge.
Little is believed to have mainly targeted marginalised women, whose bodies were frequently unidentified and whose deaths were not investigated.
Little has confessed to three total murders in Arkansas; West Memphis, Pine Bluff, and Little Rock.
"For many years, Samuel Little believed he would not be caught because he thought no one was accounting for his victims", ViCAP Crime Analyst Christie Palazzolo says in a detailed, multi-media news release.
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Now the Federal Bureau of Investigation is looking for help identifying the rest of his victims, a task it says is all the more urgent because of Little's age, poor health and sometimes faulty memory. Prosecutors say they have closed dozens of homicide investigations dating back almost five decades, some of them cases they feared would never be solved.
Some of his victims were on the margins of society. Many of Little's victims were originally ruled overdoses or attributed to accidental or undetermined causes.
In some instances, their bodies were never found.
The agency had previously shared Little's coloured portraits of his victims, which he drew in prison, in an effort to identify more victims. "She was tall for a woman, attractive shape, and, uh, friendly". When they reached Cincinnati, the two of them spent time downtown on Vine Street. Little described driving to a hilly area not far from I-75.
He claimed they shoplifted together and one day he drove her outside the city limits and down a dirt road where he strangled her. He would dump their bodies and soon after leave town. "She was pretty. Light colored, honey brown skin", he said with a small smile.
It was 1982, they usually met in a membership.
The woman told Little that she lived with her mother, who was sickly and possibly an invalid.
The statement released by the Federal Bureau of Investigation also says Little is the most prolific serial killer in US history.