Much depends on where your sister and her husband lived during their marriage and immediately after. Under Oregon rules, any divorce proceeding (for dissolution of marriage) must be filed in the county where the petitioner (the person filing the action) has lived for at least six months prior to the filing. If he filed for dissolution, did not have her served, and then got a default dissolution decree, then she is divorced. If he just took off to another state and married someone else after he got there, your sister is still married and he could be charged with criminal bigamy. Your sister should check with a local lawyer on this.
Answered on Mar 09th, 2016 at 4:55 PM