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LUNEBURG, GERMANY - JULY 15: Oskar Groening, 94, a former member of the Waffen-SS who worked at the Auschwitz concentration camp during World War II, awaits the verdict in his trial on July 15, 2015 in Lueneburg, Germany. Groening was accused of complicity in the murder of 300,000 mostly Hungarian Jews at Auschwitz in 1944. He worked as an accountant for the SS at Auschwitz and has admitted moral and personal responsibility for his role there. Groening has been convicted of being an accessory to murder, and sentenced to four years in prison. (Photo by Hans-Jurgen Wege - Pool/Getty Images)

LUNEBURG, GERMANY - JULY 15:  Oskar Groening, 94, a former member of the Waffen-SS who worked at the Auschwitz concentration camp during World War II, awaits the verdict in his trial on July 15, 2015 in Lueneburg, Germany. Groening was accused of complicity in the murder of 300,000 mostly Hungarian Jews at Auschwitz in 1944. He worked as an accountant for the SS at Auschwitz and has admitted moral and personal responsibility for his role there. Groening has been convicted of being an accessory to murder, and sentenced to four years in prison. (Photo by Hans-Jurgen Wege - Pool/Getty Images)

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LUNEBURG, GERMANY - JULY 15: Oskar Groening (C), 94, a former member of the Waffen-SS who worked at the Auschwitz concentration camp during World War II, is helped into court by lawyer Susanne Frangenberg (L) on July 15, 2015 in Lueneburg, Germany. Groening was accused of complicity in the murder of 300,000 mostly Hungarian Jews at Auschwitz in 1944. He worked as an accountant for the SS at Auschwitz and has admitted moral and personal responsibility for his role there. Groening has been convicted of being an accessory to murder, and sentenced to four years in prison. (Photo by Hans-Jurgen Wege - Pool/Getty Images)

LUNEBURG, GERMANY - JULY 15:  Oskar Groening (C), 94, a former member of the Waffen-SS who worked at the Auschwitz concentration camp during World War II, is helped into court by lawyer Susanne Frangenberg (L) on July 15, 2015 in Lueneburg, Germany. Groening was accused of complicity in the murder of 300,000 mostly Hungarian Jews at Auschwitz in 1944. He worked as an accountant for the SS at Auschwitz and has admitted moral and personal responsibility for his role there. Groening has been convicted of being an accessory to murder, and sentenced to four years in prison. (Photo by Hans-Jurgen Wege - Pool/Getty Images)

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LUNEBURG, GERMANY - JULY 15: Oskar Groening, 94, a former member of the Waffen-SS who worked at the Auschwitz concentration camp during World War II, awaits the verdict in his trial on July 15, 2015 in Lueneburg, Germany. Groening was accused of complicity in the murder of 300,000 mostly Hungarian Jews at Auschwitz in 1944. He worked as an accountant for the SS at Auschwitz and has admitted moral and personal responsibility for his role there. Groening has been convicted of being an accessory to murder, and sentenced to four years in prison. (Photo by Hans-Jurgen Wege - Pool/Getty Images)

LUNEBURG, GERMANY - JULY 15:  Oskar Groening, 94, a former member of the Waffen-SS who worked at the Auschwitz concentration camp during World War II, awaits the verdict in his trial on July 15, 2015 in Lueneburg, Germany. Groening was accused of complicity in the murder of 300,000 mostly Hungarian Jews at Auschwitz in 1944. He worked as an accountant for the SS at Auschwitz and has admitted moral and personal responsibility for his role there. Groening has been convicted of being an accessory to murder, and sentenced to four years in prison. (Photo by Hans-Jurgen Wege - Pool/Getty Images)

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LUNEBURG, GERMANY - JULY 15: Protesters demonstate outside the trial of Oskar Groening, 94, a former member of the Waffen-SS who worked at the Auschwitz concentration camp during World War II, on July 15, 2015 in Lueneburg, Germany. Groening was accused of complicity in the murder of 300,000 mostly Hungarian Jews at Auschwitz in 1944. He worked as an accountant for the SS at Auschwitz and has admitted moral and personal responsibility for his role there. Groening has been convicted of being an accessory to murder, and sentenced to four years in prison. (Photo by Hans-Jurgen Wege - Pool/Getty Images)

LUNEBURG, GERMANY - JULY 15: Protesters demonstate outside the trial of Oskar Groening, 94, a former member of the Waffen-SS who worked at the Auschwitz concentration camp during World War II, on July 15, 2015 in Lueneburg, Germany. Groening was accused of complicity in the murder of 300,000 mostly Hungarian Jews at Auschwitz in 1944. He worked as an accountant for the SS at Auschwitz and has admitted moral and personal responsibility for his role there. Groening has been convicted of being an accessory to murder, and sentenced to four years in prison. (Photo by Hans-Jurgen Wege - Pool/Getty Images)

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Defendant and German former SS officer Oskar Groening , 94, dubbed the "bookkeeper of Auschwitz", attends his trial on July 1, 2015 at the courtroom at the 'Ritterakademie' venue in Lueneburg, northern Germany. Groening and a survivor of the Nazi death camp testify in a German court as his historic trial nears a verdict. AFP PHOTO / RONNY HARTMANN (Photo credit should read RONNY HARTMANN/AFP/Getty Images)

Defendant and German former SS officer Oskar Groening , 94, dubbed the "bookkeeper of Auschwitz", attends his trial on July 1, 2015 at the courtroom at the 'Ritterakademie' venue in Lueneburg, northern Germany. Groening and a survivor of the Nazi death camp testify in a German court as his historic trial nears a verdict. AFP PHOTO / RONNY HARTMANN        (Photo credit should read RONNY HARTMANN/AFP/Getty Images)