Two NYPD officers finally met on Wednesday after they became attached forever via a kidney donation.

Officer Tommy Alexander had been on dialysis for the last three years and was desperately in need of a new kidney. Enter Sgt. William Gaspari.

Gaspari, who never met Alexander before, became aware of Alexander’s situation and wanted to help. He decided to donate his own kidney.

"Sergeant (Gaspari) came to my rescue and gave me a kidney,” Alexander told News 12. “So, it was fantastic."

“This has been building for a while, I’ve known him for a long time without ever meeting him just because of everything and it was definitely a cascade of emotions there."

The donation of Gaspari's kidney to Alexander was made possible through the National Kidney Donation organization's donor voucher program.

"Typically, a deceased kidney only lasts about 10 years,” said Michael Lollo, president of the National Kidney Donation Organization. “A living kidney is at least double that.”

How the voucher program works is kind of like paying it forward. Gaspari was not a perfect match for Alexander, but by donating his kidney into the pool, he was able to receive a kidney that was a match for him.

"So, with this program, it's allowing us to find people outside of our immediate family members or friends who are not able to donate,” added Lollo.

Just like Alexander, Officer Vadrien Alston -- who has stage 4 renal cancer -- hopes that she can also find a donor through the program.