US serial killer confess 90 murders

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.

Little is currently serving life in prison after being sentenced in 2014 for the murders of three women.

State and federal agencies are 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 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.

DNA samples taken from Little were then linked to the unsolved deaths of three women in Los Angeles county in 1987 and 1989.

All three of those victims had been beaten and strangled before their bodies were dumped separately.

He pleaded not guilty at trial, but was eventually sentenced to three consecutive life sentences with no chance of parole.

Before that he already had an extensive criminal record, with offences including rape and armed robbery.