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A man who has confessed to killing more than 90 women is the most prolific killer in US history.

The FBI said Samuel Little has confessed to 93 murders. Federal crime analysts believe all of his confessions are credible and officials have been able to verify 50 confessions so far.

Investigators also provided new information regarding five other cases.

The 79-year-old is currently serving multiple life sentences in California.

-Noah Harte