ZAGREB, CROATIA - Dinko Sakic, the last known living commander of a World War II concentration camp, who had been serving a 20-year sentence for war crimes, has died. He was 87.

Sakic, a former chief of Croatia's infamous Jasenovac camp, died Monday in a hospital in Zagreb, officials said.

Sakic had heart problems and had been receiving treatment.

Sakic fled Croatia at the end of the war, when the country's pro-Nazi regime was crushed. He had lived peacefully in Argentina for decades until 1998, when he was extradited to Croatia for a trial.

In 1999, Zagreb district court sentenced him to 20 years in prison -- the maximum penalty at the time -- for carrying out or condoning the torture and slayings of inmates while in charge of the Jasenovac camp in 1944.

Tens of thousands of Serbs, Jews, Gypsies and anti-fascist Croats were killed in Jasenovac, the worst of about 40 camps run by the then-Nazi puppet state in Croatia.

Sakic never regretted his role in Jasenovac, defiantly claiming that all he did was for the good of Croatia and that "no harm was done" to the inmates.