The couple will wed in a 3 p.m. ceremony on May 19 at the Old Woolen Mill in Cleveland.
The bride-elect is the granddaughter of Betty Berry of Cleveland and the late Jack Berry, Willa Childrey, also of Cleveland, and the late Wendell Childrey. She is the sister of Keith Childrey of Nashville and Kirstin Bradshaw of Oklahoma City.
Miss Walker is a 2005 graduate of Walker Valley High School and a 2008 graduate of Tennessee Technological University.
She is employed in the office of Surface Mining.
Mr. Erreger is the grandson of the late Edward and Nadine Erreger, the late Richard and Jetty Danka and Barbara Danka of Raleigh. He is the brother of Nicole Erreger of Roswell, Ga., and Briana Thran of Woodstock.
He is a 2005 graduate of Roswell High School and attended Jacksonville State University.
He is the production manager at U.S. Lawns in Knoxville.