They met in 1998 and married in 2003. Two years later, Tommy's kidneys started failing.
When they started looking for a matching donor, Christa was the first tested and she was a near perfect match.
Medical experts say kidney matching with blood relative is rare and difficult, but having a wife who is a non-relative that's nearly a perfect match, is a miracle.
Even though the couple now has two young sons, Christa said she never had second thoughts about donating a kidney to her husband.
"That's what love is, that's the bottom line, do whatever for the other person," she said.
Tommy says at first he worried about Christa's health if she gave up a kidney, but now he says her strength and their faith has given him a second chance.
"We want to raise our kids to appreciate the word love, instead of just using it in everyday language show them firsthand," he said.
The couple will undergo the transplant on Oct. 20, at UNC Hospitals in Chapel Hill.