1. A person who marries another person, while married to another person, is guilty of a class C felony.
2. Subsection 1 does not extend to:
a. A person whose spouse has been absent for five successive years and is believed by him or her to be dead.
b. A person whose spouse has voluntarily absented himself and has continually remained without the United States for the space of five successive years.
c. A person whose former marriage has been pronounced void, null, or dissolved by the judgment of a competent court.