Gladys Heflin Mercer, 90, of Petal, Miss., died Sunday at Holston Manor Nursing Home in Kingsport. Visitation will be at 10 a.m. Saturday at the First Church of the Nazarene. Services will be held at 11 a.m. Saturday at the church. Hulett-Winstead Funeral Home of Hattiesburg, Miss. is in charge.