An imprisoned murderer is being investigated after confessing to 90 killings across four decades in the US.
The FBI believe Samuel Little, who is 78, may be among the most prolific serial killers in US criminal history.
State and federal agencies are now working to match his confessions with the deaths of dozens of women across the country from 1970 to 2005.
Investigators say they have already linked him to 34 murders and are working to corroborate many others.
Little is currently serving life in prison after being sentenced in 2014 for the murders of three women.
He has been in custody since September 2012 when he was arrested at a Kentucky homeless shelter and extradited to California where he was wanted on a drugs charge.
