This is the tearjerking moment a bride whose life was saved by an organ donation was walked down the aisle at her wedding by her donor's father.

Diana Donnarumma, 28, from Buffalo, New York, fought back tears as Daniel Donnelly Jr held her hand as they walked into the reception so she could marry her fiance, Conlan Kreher.

But before getting to the altar, Daniel, whose donor daughter Heather died in a car accident in 2017, passed Diana back to her own father, who thanked him for his daughter's gift. 

An intestinal transplant from Heather had helped save Diana's life, as she was previously in intestinal failure due to the progression of her Dysautonomia, also known as automatic dysfunction.

A year after the transplant, Diana was allowed to reach out to her donor's family, who are given the option to either accept or deny the request.

Diana's letter went through her transplant center in Washington DC to a Texas organ donation center, which then contacted Daniel.

Daniel accepted the letter, and he and Diana later spoke by phone, which, Diana said, caused her to cry for two days straight, having discovered what a wonderful person Heather was.

In the years since, Diana has tried to raise awareness of Heather's life and organ donation through her social media pages, and she and Daniel eventually met in Illinois, where Daniel lives.

There, he told Diana that it was Heather's decision to donate, and how his daughter had passed away just a few days before she was due to marry her own fiancé, Beau.