In 2012, a European research study addressed trauma suffered by persons who witnessed legal assisted suicide in Switzerland. The study found that one out of five family members or friends present at an assisted suicide was traumatized. These people,
experienced full or sub-threshold PTSD (Post Traumatic Stress Disorder) related to the loss of a close person through assisted suicide.
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 “Death by request in Switzerland: Posttraumatic stress disorder and complicated grief after witnessing assisted suicide,” B. Wagner, J. Muller, A. Maercker; European Psychiatry 27 (2012) 542-546, available at http://choiceisanillusion.files.wordpress.com/2012/10/family-members-traumatized-eur-psych-2012.pdf