John Demjanjuk (born Ivan Mykolaiovych Demianiuk; Ukrainian: Іван Миколайович Дем'янюк; 3 April 1920 – 17 March 2012) was a retired Ukrainian-American auto worker, a former soldier in the Soviet Red Army and a POW during theSecond World War.

Though he was a survivor of the notorious Nazi concentration camps system, he was convicted in 2011 by the German court for alleged war crimes as an accessory to the murder of 27,900 Jews while acting as a guard named Ivan Demjanjuk at the Nazi extermination camp near Sobibór in occupied Poland. Since his conviction was pending appeal at the time of his death,[3][4][5] Demjanjuk remains presumed innocent under German law, and his earlier conviction is invalidated. According to the Munich state court, Demjanjuk does not have a criminal record.[6]

Demjanjuk was born in Ukraine, and during World War II was drafted into the SovietRed Army, where he was captured as a German prisoner of war. In 1952 he emigrated from Germany to the United States, and was granted citizenship in 1958 whereupon he formally anglicized his name from "Ivan" to "John".

In 1986 he was deported to Israel to stand trial for war crimes, after being mistakenly identified by Israeli Holocaust survivors as "Ivan the Terrible", a notorious guard at the Treblinka extermination camp in Nazi occupied Poland. Demjanjuk was accused of committing murder and acts of extraordinarily savage violence against camp prisoners during 1942–43. He was convicted of having committed crimes against humanity andsentenced to death there in 1988. The verdict was overturned by the Israeli Supreme Court in 1993, based on new evidence that "Ivan the Terrible" was likely another man, Ivan Marchenko. After the trial, in September 1993, he returned to his home in Ohio. In 1998 his citizenship was restored after a United States federal appeals court ruled that prosecutors had suppressed exculpatory evidence concerning his identity.

In 2001 Demjanjuk was charged again, this time on the grounds that he had, instead, served as a guard named Ivan Demjanjuk at the Sobibór and Majdanek camps in Nazi occupied Poland and at the Flossenbürg camp in Germany. Demjanjuk became again a stateless person in 2002 (until his death in 2012). His deportation was again ordered in 2005, but after exhausting his appeals in 2008 he still remained in the United States, as no country would agree to accept him at that time. On 2 April 2009, it was announced that Demjanjuk would be deported to Germany, where he would stand trial, since in a bid to disassociate from the nation's past Germany began the policy of prosecuting prisoners of war from other nations whom the German Nazi made the accessories to their crimes. On 11 May, Demjanjuk left his Cleveland home by ambulance, and was taken to the airport, where he was deported by plane, arriving in Germany the next morning. On 13 July, he was formally charged with 27,900 counts of acting as an accessory to murder, one for each person who died at Sobibor during the time he was alleged to have served as a guard. On 30 November, Demjanjuk's trial began inMunich.

On 12 May 2011, Demjanjuk was convicted pending appeal by an ordinary German criminal court as an accessory to the murder of 27,900 at Sobibor and sentenced to five years in prison. The interim conviction was later annulled, because Demjanjuk died before his appeal could be heard. He was later released pending trial and final verdict by the German Appellate Court. He lived at a German nursing home in Bad Feilnbach, where he died on 17 March 2012. Despite decades of legal wrangling and controversy, Demjanjuk died a free man and legally innocent.