Officer Megan Ambrose surprised her close friend and on-duty partner with a kidney

Officer Stanley Barsch has been diagnosed with Polycystic Kidney Disease and his friend Megan turned out to be a 100 percent match as a kidney donor.
1:48 | 03/16/19

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Transcript for Officer Megan Ambrose surprised her close friend and on-duty partner with a kidney
Finally tonight, "America strong." Valentine's day is usually about hearts. But for these two friends it's another organ and a life-saving gift. Police officers Stanley Barsch and Megan ambrose hit it off from the start. His heart is as big as his personality. Megan is a warrior. Reporter: First meeting at the police academy in 2007, Megan and Stanley were partners for three years at the Montgomery county police department. Our friendship has been very strong over the years both on the job and off the job. Reporter: But Stanley had quietly been dealing with a growing problem -- his polycystic kidney disease. Your kidney gets larger and larger. The size, you know, mine are the size of about two NFL footballs, they're about 15-20 pounds a piece. Reporter: When his kidney function plummeted to 13% before Christmas last year, Stanley knew he needed help. He turned to his loved ones. It couldn't have been more clear that this was my purpose. Reporter: Megan went in for testing to see if she could be a donor and she turned out to be a 100% match. Megan kept the good news a secret from Stanley, waiting until this moment to present him with a handwritten card. Turns out that we are a perfect match not only on the job but in blood and organs too. You always had my back on the road and off. Now you can have my kidney. I'm honored to be able to give you the gift of life. Reporter: You can see that reality setting in for Stanley, he would have a new chance at life. And I love you for it. I love you too. Reporter: The surgery now set for this may. Both Stanley and Megan hopeful for their futures. We thank you so much for watching. I'm Tom llamas. "Good morning America" and "This week" tomorrow morning. Have a great evening. Good night. If you compare the DNA of

This transcript has been automatically generated and may not be 100% accurate.

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