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FRANKFORT, Ill. – Years ago, a man donated a piece of his liver to a stranger, and last weekend she gave him her heart in return. They were married in a church outside Chicago this weekend.

Doctors diagnoses Heather Krueger with stage 4 liver disease several years ago. Without a donor, she had just a few months to live.

Chris Dempsey of Frankfort, Illinois never met Heather, but he overheard a colleague at work talking about her dire situation and decided to get tested to see if he’d be a match. The former Marine says he is programmed to help others.

Heather recalled their first unofficial date in and interview with CBS News.

“We had lunch together, discussed what the whole process was going to be,” Heather said.

The transplant was successful, and the two stayed in touch, eventually falling in love. Last weekend, they tied the knot in a touching ceremony in front of family and friends.

“You are the most incredible man I have ever known,” Heather told Chris in her wedding vows. “You believe in me and you make me feel amazing every single day. Because of you, I laugh, smile and I dare to dream again.”

Watch the touching story below: