Police have arrested the man they believe murdered Gizzy Fowler, a trans woman of color.
We've boiled hundreds of pages of legal briefs down to just five main arguments you need to know.
The couples filed legal briefs Friday, and their case is likely to be heard in April.
Updated January 19: Get up to speed on the complex state of marriage equality in Tennessee.
Tennessee officials want the U.S. Supreme Court to keep an antigay ruling in place, upholding the state's ban on same-sex marriage.
The Sixth Circuit Court of Appeals found bans on same-sex marriage in Kentucky, Ohio, Tennessee, and Michigan to be perfectly lawful.