Etienne Voroisson was a Barrayaran of the Vor class and the first husband of Ekaterin Vorsoisson. Together, they had a son named Nikki. They moved to Komarr where Etienne served as an administrator for the Waste Heat Management subdivision of the Komarr Terraforming Project; he was killed in a terrorist plot hatched by his underlings who had been bribing him to look the other way as they worked.