Woman Donates Kidney to Stranger, Now They're Getting Married

She gave him her kidney, then her heart.

"As soon as we started dating -- not long after that -- was when we realized, this was it," McIntyre, 25, told ABC News.

"It was just like one thing after another for them," McIntyre said. "I was like, 'Well, I'm type-O and I don't have any health problems.'"

The next day, she called to volunteer her kidney, and the testing started shortly thereafter, she said. McIntyre didn't want to meet the man, Danny Robinson, until she knew she was a match, fearing that she would get his hopes up, she said.

When they finally did meet, in March, McIntyre was nervous, she said. And though she thought he was cute, she never dreamed they would date.

"As soon as we started talking, it was like our families had known each other forever," McIntyre said.

If he waited for a kidney from a deceased donor, it could take an average of three years, Shah said. Getting on local radio changed everything for him.

"I don't know why he did it, but I'm glad he did," Shah said.

"On June fifth, we made it official," she said.

And on Christmas Day, after all the presents were opened, Robinson pulled out one more gift: a small, wrapped box containing an engagement ring. He got down on one knee and asked her to marry him.

"He is truly a genuinely good person," McIntyre said. "We have so much fun together."

Their baby girl is due in June.

"He's going to be a great dad," she said.