She is preceded in death by parents, Clements Eugene Nichols and Dovie Elizabeth Nichols; husband, Marshall Donald "Dinkum" Barnett.
She is survived by daughters, Diane Barnett Roper (late Grady Roper) and Donna Barnett Serrano (Jorge); five grandchildren, Robert Greg Roper (Regina), David Polk (Angie), Dana Serrano (Enrique), Devin Caldwell (Brittany), and Guadalupe Serrano; five great-grandchildren, Jose Serrano, Ada Serrano, Amos Polk, Bella Swan, and Gavin Dodd.
A visitation will be held on Wednesday, April 3, 2024 at Rockco Funeral Home from 5 pm - 7 pm. Funeral service for Mary Ann will be Thursday, April 4, 2024 at 2 pm at Rockco Funeral Home in Montevallo, Alabama. Burial will follow after service at Shelby Memory Gardens.