John Demjanjuk, 90, was deported to Germany from the United States in 2009 to face 28,000 counts of accessory to murder during his alleged time as a guard at the Sobibor death camp during World War II, WEWS-TV, Cleveland, reported Tuesday.
Demjanjuk has denied any involvement.
Demjanjuk has various health problems and was taken to a Munich hospital for a blood transfusion, officials said.
His trial, which began last November, has been interrupted eight times for health reasons, WEWS-TV reported.
Notable deaths of 2014 [PHOTOS]