Laszlo Csatary, a Nazi war crimes suspect, died awaiting trial after multiple health complications on Saturday, the BBC reported.
Csatary, 98, was listed on the top of the most-wanted Nazi war criminals after he allegedly deported more than 17,500 Jews to death camps during World War II. He faced charges in his home country of Hungary and Slovakia, a neighboring country.
Gabor Horvath, Csatary's lawyer, said he was suffering from several health issues but ultimately died from pneumonia.
Csatary was charged in June by Hungarian prosecutors for his alleged role as chief of an internment camp for Jews in Kosice -- a town which used to be a part of Hungary but is now in Slovakia. He maintained his innocence and claimed to be a middleman between German and Hungarian officials, never participating in the death camps.
Kassa, which is now known as Kosice, was the first camp created in Hungary after Germany's occupation of the land in 1944.
According to the prosecutors, Csatary, who was a police officer in Hungary at the time, "deliberately provided help to the unlawful executions and torture committed against Jews deported to concentration camps... from Kosice."
They asserted that during his time as an officer, he beat prisoners with his bare hands as well as a dog whip.
The Simon Wiesenthal Center, a global Jewish human rights organization, named Csatary as the most wanted suspect in 2012, claiming he directed the deportation of Jews from Kosice to Auschwitz.
Reporters from The Sun Newspaper in England, with the assistance of The Simon Wiesenthal Center, found Csatary in Budapest last July. He was placed under house arrest.
"It is a shame that Csatary, a convicted... and totally unrepentant Holocaust perpetrator who was finally indicted in his homeland for his crimes, ultimately eluded justice and punishment at the very last minute,'' said Efraim Zuroff, director of The Simon Wiesenthal Center.
