Discretion is advised. This is 10-minute murder. I'm Once they're in custody, it's common for criminals to begin confessing to multiple crimes,

often including murders that they didn't commit, or imaginary killings that never even took place.

Sometimes it's an attempt to get a shorter prison sentence, somehow, or a better plea bargain.

But on other occasions, it's a violent criminal's last chance to exert power over others

by leading authorities on a wild goose chase.

But when Samuel Little was convicted of murder,

the FBI spent the next three years

seeing if any unsolved cases could be linked to him,

and what they found didn't even scratch the surface.

They only found out the true extent of Samuel's crimes

when he began to confess to a dizzying number of murders,

totaling almost 100 kills in more than three decades.

He was confessing in the hope that he would be transferred to a different prison,

but investigators quickly realized that Samuel didn't seem to be lying.

One by one, they fact-checked the details that Samuel gave them.

It all lined up. They hadn't just caught a murderer. They'd caught one of the most prolific serial

killers in the history of the United States. But why spend so much time chasing down the

victims of a man already spending the rest of his life in

prison. Christy Pala Zolo, a crime analyst for the FBI's violent criminal apprehension program,

described why it was so important to track down as many as Samuel's victims as possible.

For many years, Christy said, Samuel Little believed he would not be caught because he thought no one

was accounting for his victims. Even though he is already in prison, the FBI believes it's

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