Vetter was a doctor at the Auschwitz extermination camp, appointed chief doctor by Reichsführer-SS Heinrich Himmler. He joined other doctors (such as Hans König, Heinz Thilo, and Fritz Klein) in the task of choosing employable Jews to operate the industrial machines and sending others to the gas chambers. He also carried medical experiments on prisoners, involving phenol injections  As paid retainer of IG Farben, Vetter would also deliberately infect prisoners in Auschwitz, Dachau and Gusen to carry out medical experiments. After the war, Vetter was found guilty of committing crimes against humanity. He was hanged in the prison of Landsberg am Lech.
- Victims and Survivors of Nazi Human Experiments Paul Weindling page 76
- Epidemics and Genocide in Eastern Europe, 1890-1945 Paul Weindling, page 359