Ind. Code § 35-46-1-2 – Bigamy

(a) A person who, being married and knowing that the person's spouse is alive, marries again commits bigamy, a Level 6 felony.
(b) It is a defense that the accused person reasonably believed that the person was eligible to remarry.
As added by Acts 1976, P.L.148, SEC.6. Amended by Acts 1977, P.L.340, SEC.85; P.L.158-2013, SEC.548.