Mohamed Salim – who has admitted killing so many villagers in wartorn Sudan that he lost count – was tracked down to a semi in a leafy street in Birmingham.
An investigator from the International Criminal Court in the Hague contacted the Daily Mirror to say they wanted to interview him as a witness in connection with a probe in the Darfur region.
He said: “We were made aware of the Mirror’s work on this person by a human rights charity.
“We are compiling information on the Darfur crisis and at the moment we want to interview him as a witness.
Salim had been interviewed on BBC's Newsnight a few years ago where he told journalists: “When we go into a village and find resistance we kill everyone.”
The Home Office tried deporting him but lost on human rights grounds in an immigration court.
Taxpayers funded his life here.
He told the Mirror at the time: “My life here is normal.