How does my fiance obtain permanent resident status?
Once your fiancé has obtained their immigrant visa to come to the United States, their fiancé visa, you need to be married within 90 days of their entry.
Once you are married, you will have to file for an I-45 along with the financial and medical documentation.
Immigration will request an interview to make sure you are still in the relationship and that they are admissible to the United States.