Mary Carol Winkler is an American woman who was convicted of voluntary manslaughter in the 2006 shooting of her husband, Matthew Winkler, the pulpit minister at the Fourth Street Church of Christ in the small city of Selmer, Tennessee.

Selmer is a city in and the county seat of McNairy County, Tennessee, in the southwestern part of the state. The population was 4,396 at the 2010 census and estimated at 4,400 at the 2018 census. It is named after Selma, Alabama.