Detective Roy McBeth has polycystic kidney disease, which causes the body to lose its ability to filter toxins and produce red blood cells.
McBeth was diagnosed with the genetic disease when he was a boy, but a healthy lifestyle kept the doctor at bay until two years ago.
He started feeling symptoms that included overwhelming fatigue, constant headaches and nausea.
"The doctor basically told me I had a 12 to 18 month window before I would have to be on dialysis," said McBeth. "My kidneys were failing."
He first approached his immediate family, but couldn't find a match. Then his wife suggested he put the call out to his colleagues.
"It took me a long time to put together the words," said McBeth, who sent out the notice through his union.
Several of his colleagues signed up for testing to see if they were a match, including his boss Inspector Kevin Wright.
Wright says he could see the difference in McBeth as soon as he woke up from surgery on Wednesday.
"It was pretty cool to see the difference in Roy's appearance already," said Wright.
"My energy is more now than it has been in a long time," said McBeth.
Part of the reason why he decided to go public with his story is because his 12-year-old son also has the disease.
"I wanted people to know you can be a live donor for someone who's anonymous to you," said McBeth. "It can change someone's life."