It's a presence that can be felt and seen on the walls of Colorado 's 17th Judicial District Attorney's Office.

"He was just a tremendous public servant," District Attorney Brian Mason said. "I go in [the training room] from time to time and look at his picture and think about him and hope that he'd be proud about the work that I do, and the work that we continue to do here."

That is how highly Mason thought of Chief Deputy District Attorney Sean May.

"He was shaping prosecutors, including me, into attorneys of integrity, and that's the kind of attorney and man he was," Mason said.

District Attorney Brian Mason CBS

However, Mason's mentor and friend's passion for pursuing justice was cut short when May was shot and killed outside his Denver home in 2008. The 37-year old's wife was s

See Full Page