Art. 90 PILA from 2022

Art. 90 II. Applicable law
1 The estate of a person who had their last domicile in Switzerland is governed by Swiss law.
2 A foreign citizen may, however, submit their estate by will or contract of succession to the law of one of their states of citizenship. Such submission lapses if, at the time of death, the deceased no longer had such citizenship or had acquired Swiss citizenship.
Es besteht kein Anspruch auf Aktualität und Vollständigkeit/Richtigkeit.