Bigamy is any of the following:
Marriage within this state by any person who shall have another spouse living at the time of such marriage;
Marriage within this state by an unmarried person to a person known to such unmarried person to be the spouse of some other person;
Cohabitation within this state after marriage in another state or country under circumstances described in subsection 1.1 or subsecttion 1.2 of this section.
It shall be a defense to a charge of bigamy that the accused reasonably beleived the prior marriage had been dissolved by death, divorce, or annulment.
Bigamy is a class E felony