The 79-year-old was convicted in 2014 for the murder of three women in Los Angeles in the 1980s.
Little, a California inmate pronounced by the Federal Bureau of Investigation the most prolific serial killer in us history, has confessed to 93 slayings committed across the country between 1970 and 2005, recounting the crimes with astonishing, near-photographic detail and even drawing color portraits of dozens of the women he strangled.
"FBI crime analysts believe all of his confessions are credible".
The FBI is asking for the public's help in matching the remaining unconfirmed confessions.
The FBI's Violent Criminal Apprehension Program crime analyst Christie Palazzolo said: "For many years, Samuel Little believed he would not be caught because he thought no one was accounting for his victims".
"Little says he strangled his 93 victims between 1970 and 2005".
Many of Little's victims were originally thought to have died from overdoses or in accidents, the Federal Bureau of Investigation said.
Four days later, her body was found along County Road 325.
Little targeted vulnerable individuals, mostly black women, many of whom were sex workers or drug users, officials say.
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He was first arrested on September 5, 2012, at a Kentucky homeless shelter, after authorities used DNA testing to establish that he was involved in the murders of Carol Elford, Guadalupe Apodaca and Audrey Nelson. He pleaded not guilty at trial, but was eventually convicted and sentenced to three consecutive life sentences, with no chance of parole.
Social media critics have said many of Little's victims' deaths were not properly investigated because of apathetic and even racist attitudes of detectives, especially in southern states.
In another case, Little detailed strangling a woman in 1993 in a motel room in Las Vegas.
You can access a list of Little's unmatched confessions here.
In another video, he described a victim in New Orleans.
Previously Gary Ridgway, known as the "Green River Killer", was considered the US's most prolific serial killer, having pleaded guilty in 2001 to killing 49 women and girls.
Ted Bundy confessed to 30 homicides from about 1974 to 1978.
Numerous murders that he has confessed to bear similarities to those of Carol Alford, 41, Audrey Nelson, 35, and Guadalupe Apodaca, 46 - the three women he was originally convicted of killing and sentenced to three terms of life with no parole. The Knoxville News Sentinel reported in December that a cold case investigator with the Knox County Sheriff's Office had identified the victim who Little called "Martha".