The killer has been serving a life sentence since 2014 for three murders and his confessions were filmed in prison during interviews with a Texas Ranger.
After five years of linking cases to confessions, Federal Bureau of Investigation analysts have declared confessed murderer Samuel Little "the most prolific serial killer in us history" and are now seeking the public's help matching as many as 43 unconfirmed confessions.
The FBI has also shared drawings Little made of many of his victims in the hope that they may help people identify the women.
Little claims he has killed as many as 93 victims.
Samuel Little, who has been behind bars since 2012, told FBI investigators past year that he was responsible for about 90 killings nationwide between 1970 and 2005. The FBI noted that numerous deaths of Little's victims had originally been ruled as overdoses or from accidental or unknown causes.
The FBI says they have matched that case to a Jane Doe reported in Dade County, but they have never identified her.
Law enforcement authorities in several states have verified 50 of his confessions so far and are scrambling to link dozens more cold cases to his recollections.
The flood of confessions came after James Holland, a Texas Ranger who specializes in cold cases, sought out Little previous year.
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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.
Little confessed to his crimes in a bid to secure a prison transfer. "He remembers her as being 5'6" - 5'7" tall and 130-170 pounds.
While Little has offered many details, investigators fear that his memory is becoming not entirely reliable.
One of the surprising aspects of this case is Little's ability to recall what his victims looked like, an amount of recall that is "unusual", Van Zandt said.
On of the 93 cases is a woman Little claims to have met in Chattanooga, who he then strangled and dumped off I 24 in Dade County in 1981.
© Albert Cesare/The Cincinnati Enquirer, via Associated Press Samuel Little, wearing blue on a screen, pleaded guilty in August to killing two women in Cincinnati in the 1980s.
Little has been in prison since 2012 and, officials said, will likely stay there until his death.
The FBI is encouraging anyone with information on Little to come forward and get in contact with investigators.
When Martha Cunningham was found dead near Knoxville, Tenn., in January 1975, her body was bruised, her clothes had been pulled off and she was missing her purse.