According to The Sun, which cited documents released by the Wiesenthal Center, Csizsik-Csatary beat Jewish women with a whip he carried on his belt.

"A variety of factors" led to the center's locating Csizsik-Csatary in Budapest, Zuroff said. "He wasn't hiding under a false name. ... He had no reason to fear."

Using the last name Csizsik, Csizsik-Csatary arrived in Canada in 1949, telling immigration officials he was Yugoslavian, according to The Toronto Star newspaper.

A spokeswoman for Canada's Department of Justice, Carole Saindon, said Monday that "It was alleged that when applying to immigrate to Canada, (Csizsik-Csatary) provided false information about his nationality, and failed to provide information concerning his collaboration with Nazi occupation forces while serving with the Royal Hungarian Police. It was further alleged that he participated in the internment and deportation of thousands of Hungarian Jews to concentration camps. As a result, the government of Canada revoked his citizenship on August 28, 1997.

As deportation proceedings were under way, Csizsik-Csatary voluntarily left the country, Saindon said in an e-mail to CNN.

In October 1997, Paul Vickery, head of the Canadian Justice Department's war crimes unit, told Radio Free Europe that when officials went to Csizsik-Csatary's Toronto home, his daughter told them he was living in Europe. Vickery told the network Csizsik-Csatary's name would be placed on a watch list and he would be barred from re-entering Canada.

Csizsik-Csatary initially denied the allegations and asked the Canadian government to put the case on trial, but later withdrew that request, The Toronto Star reported in August 1997.

"In his statement of defense, Csizsik-Csatary admitted to some involvement in the ghettoization of Jews, to handing over at least two Jews to the Germans and to attending the last mass deportation of Jews out of Kassa (Hungary)," the Star said.

The Sun said in its Sunday report that Csizsik-Csatary's attorneys claimed he did not know where the Jews were being sent. Of the 12,000 Jews transferred from a ghetto to a brickyard and deported, only 450 survived, the Sun reported.

Csizsik-Csatary returned to Hungary upon leaving Canada, Zuroff said. "Hungarian authorities knew that he was back," he said. Authorities in Hungary launched an investigation in September 2011 after receiving information from Zuroff regarding Csizsik-Csatary's residence in Budapest and his role in the Auschwitz deportations, the center said.