My response:
Bigamy won't have any relevance to your divorce in Indiana. However, it will have a lot of relevance to his personal freedom in Wisconcin.
Bigamy is a felony, which will entitle him to an all expense paid trip for one to the prison of his choice !
Yes, he'll enjoy a year or more in the luxurious ambiance of steel toilets, "lights out" at 8:00 p.m., guarded rooms (for that extra bit of safety) and three meals a day, including his choice of grits, stale bread, and all the water he can drink! Of course, he'll be sharing a Luxurious Double Bed Suite with good people, like my friend Bubba, who never seems to run out of Petroleum Jelly or KY Jelly.
Yes, all this can be his - - if "the Price is Right" !!
Report him to the authorities in Wisconcin.
IAAL