The couple will be married on Sept. 22 at Carriage Lane Inn in Murfreesboro.
The bride-elect is the granddaughter of the late Mr. and Mrs. Virgil C. King Sr., the late Wilma Thornell and the late Joe H. Thornell.
The prospective bridegroom is the grandson of Nancy and Bob Erwin of Cleveland and Glenda and Don Dillingham of Mount Juliet.
Miss Thornell is a 2001 graduate of Columbia Central High School and a 2005 graduate of Middle Tennessee State University where she majored in biology and minored in chemistry. She is also a 2009 graduate of the University of Tennessee Dental School in Memphis, where she earned a doctor of dental surgery degree. She practices at Cookeville Regional Dental Associates in Cookeville.
Mr. Erwin is a 2003 graduate of Wilson Central High School and earned a degree in business at Volunteer State University. He continued his education in youth ministries at Middle Tennessee State University and completed an internship at Green Hill Church. He is employed by Griffin Technology in La Vergne.