John R. Slack (son of Cornelius Slack and Mary Ann Richards) was born 1839 in Kanawha County Virginia, and died 1907 in Kanawha County, West Virginia.He married Nancy A. Trail on April 26, 1866 in Kanawha County, West Virginia, daughter of Henry Trail and Catherine (Unknown) Trail. More About John R. Slack and Nancy A. Trail: Marriage: April 26, 1866, Kanawha County, West Virginia.