What caused Samuel Little to confess to these murders?
Little's current life sentence comes from his conviction on three first-degree murder charges after he was found guilty of murdering three Los Angeles women. Those murders took place between 1987 and 1989, but DNA evidence only connected him to the cases in 2012. (Police found Little living in a shelter in Kentucky and arrested him.)
Little's conviction on the three murders alone make him a serial killer according to the FBI's definition of the killing of two of more victims in separate events.
Last summer, more DNA evidence linked Little to a 1994 murder in Odessa, Texas—that of Denise Christie Brothers. After a Texas Ranger, James Holland, visited Little at his California prison to question him on that case, the two developed a rapport, and Little's cascade of confessions followed.
How did Samuel Little kill his victims?
He claims to have targeted especially vulnerable women—namely prostitutes and drug addicts—and to have committed his murders across multiple states, an arc of bloodshed stretching from California to South Carolina.
Tim Marcia, a cold-case detective with the Los Angeles Police Department, told The New York Times that Little's diabolism was astonishing, even when taken within the context of homicide investigations.
"Believe it or not, you only see evil a few times in your career," Marcia said. "Looking into his eyes, I would say that was pure evil."
Update 10/7/19: The FBI has confirmed that Little is the "most prolific serial killer in U.S. history," having confessed to 93 murders. Law enforcement has been able to verify 50 of the confessions, so far, with many more pending confirmation. According to a statement on the FBI.gov website, "FBI crime analysts believe all of his confessions are credible."
Update 1/1/21: According to an announcement from the California Department of Corrections and Rehabilitation, Samuel Little died on December 30, 2020 at an outside hospital. He was 80 years old. An official cause of death has not yet been determined.