Nearly 70 years after the events, Siert Bruins, a Dutch-born German national, will take the stand in the western German town of Hagen and could face a life sentence if found guilty.
The nonagenarian, who lives in Breckerfeld in the west of Germany, is accused, along with an accomplice who has since died, of murdering the Dutch resistance fighter Aldert Klaas Dijkema in September 1944 when the two men were stationed on the Dutch-German border.
Bruins is accused of shooting Dijkema four times in the back on the night of September 21-22, 1944 after the resistance fighter was taken prisoner.
Dijkema died shortly afterwards.
Tracked down and interviewed on German television in July 2012, Bruins admitted to being present at the shooting, but claimed it was his accomplice who actually pulled the trigger.
"I was marching at the prisoner's side. Suddenly I heard a shot and he fell," he said.
Bruins was one of around 30,000 Dutch citizens who collaborated with the Nazis during the occupation of the Netherlands.
After the collapse of the Third Reich, he was condemned to death in his absence by the Netherlands in April 1949 for participating in three shootings, including that of Dijkema. The sentence was subsequently commuted to a life sentence.
Bruins had in fact obtained German citizenship via the Fuehrer's Decree in May 1943 which conferred German nationality on all foreigners who worked for the Nazis.
Bruins was, however, detained by the German authorities and sentenced to a prison term of seven years in February 1980 for complicity in the murder of two Jewish brothers in Delfzijl in the Netherlands in April 1945.
Since the Nuremberg Trials in 1945-1946, around 106,000 German or Nazi soldiers have been accused of war crimes. About 13,000 have been found guilty and around half sentenced, according to the authority charged with clearing up Nazi crimes.
Bruins was one of the last presumed Nazi criminals detained by the German authorities, as was another former SS officer, Heinrich Boere, who was sentenced to life in March 2010 for the murder of three Dutch civilians.