crimes

While investigators found some old assault allegations against Williamson, he did not appear to have any convictions for violent crimes, Corey said.

He denied that his crimes against his wife had been sparked by an inferiority complex or by a desire for revenge for an affair she had in the 1980s.

A National Institute of Justice study suggests that undocumented migrants in the US are arrested for violent and drug crimes at less than half the rate of native-born citizens.

"It adequately reflects the strong condemnation by the international community for the crimes committed by him and acknowledges the significant harm and suffering caused to the victims," she added.

He often used philanthropic work as a cover for his crimes.