BOSTON (CBS) – Three years after he was injured during a shootout with the Tsarnaev brothers in Watertown, former MBTA Transit Police Officer Dic Donohue thanked those who saved his life and said it is “great to be alive.”

Donohue was seriously injured in an exchange of gunfire with the Boston Marathon bombing suspects in the early morning hours of April 19, 2013.

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“It is a great day to be alive,” Donohue said Tuesday. “It’s April 19 and it’s three years.”

After being shot, Donohue suffered nearly fatal blood loss. He was rushed to Mt. Auburn Hospital, where he received more than 40 units of blood to save his life.

On Twitter, Donohue thanked firefighters and officers from Transit Police, State Police, Watertown Police and several other departments for helping rush him to the hospital.

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He also praised the “phenomenal doctors, nurses and staff at Mt. Auburn Hospital” who saved him.

Donohue returned to work with Transit Police in March 2015, and was promoted to sergeant two months later.

Saying he suffers from near-constant pain, Donohue retired from the force in February.

On Tuesday, he was awaiting word on the impending birth of his new baby boy.

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“Any minute now, we’re really excited and if I look back three years ago it wouldn’t have happened I was clinging to life and now it’s come basically full circle,” Donohue said.