Former Butler basketball star Andrew Smith is a fighter. Smith, who made two Final Fours as a Bulldog in 2010 and 2011, was diagnosed with T-cell lymphoblastic lymphoma in January 2014. After beating the cancer, Smith was once again diagnosed with the disease in May.

On Friday, Smith will undergo a bone marrow transplant. Smith’s wife, Samantha, posted a heartfelt letter directed to her husband’s donor. The letter begins:

“Dear Donor,

You don’t know me (yet), but I am the 24-year old wife of the 25-year old man you are saving. You don’t know us or our story, but I want you to know that our journey to this day, to this transplant, to you has been long awaited.

All I know about you is your age, your gender, and that you either live or have lived in Europe at some point in your young life. I know that you are a 20-year old male with a beautiful and selfless soul. I know that your priorities are so much greater than mine were when I was 20-years old.”

Check out the letter in its entirety here.

Brad Stevens, Smith’s former head coach, found time to visit Andrew on Tuesday while his Boston Celtics were in Indianapolis to face the Pacers.

“I’ve seen Andrew go through a lot of really tough stuff over the last two years and that son of a gun always responds,” Stevens said. “He’s as tough as they come and I have no doubt that he’ll respond again.

Our most encouraging thoughts are certainly with the Smith family. #AndrewSmithStrong