December 27, 1973. A day a young family and entire law enforcement agency will never forget.

It's been more than 40 years since Colorado State Patrol Trooper Thomas Carpenter was murdered.

“He wore a uniform, he had a badge, he was the good guy” Clay Carpenter, Thomas' son who was 9-years-old when his father was murdered said. "He loved to help people. It's what he lived for.”

Carpenter was a former marine, a husband and father to three young kids.

<p>It’s been more than 40 years since CSP Trooper Thomas Carpenter was murdered. </p>

On December 27, Trooper Carpenter stopped near the on-ramp of the Boulder Turnpike to help what looked to be a broken down car with two men inside.

No one knows exactly what transpired next, but the two men somehow got ahold of his gun, forced him back in his patrol car and made him drive around at gunpoint finally ending at an apartment complex in Montebello.

Trooper Carpenter was found in his patrol car with four bullets in the back of his head.

Retired CSP Captain Larry Tolar was in the same academy as Carpenter, class of 1968.

“Tom's the only one I know that was actually executed. We had officers shot but nobody just executed like they did to Tom and that made us very mad,” Tolar said.

<p>It’s been more than 40 years since CSP Trooper Thomas Carpenter was murdered. </p>

They had a pretty good description of the two men. Both young, one white with shaggy hair, the other black.

Detectives searched and searched in the snow for days and months on end for clues, his gun, and the murderers with the case never to be solved.

“I think the family was cheated the day of the event and they've been cheated ever since then,” Tolar said.

But Clay looks at it a little differently all thanks to his hero.

“One thing my dad taught me is to never lower myself to their level. So it was easy to forgive the people who did that. I did not concentrate on them, I concentrated on my father. How my Dad's life ended was not going to be my focus,” Clay said.

And although the case was never closed, Tolar believes the murderers paid for their crimes.

“I'm pretty sure justice was served one way or another,” Tolar said. “I guess we will never know what happened. All we know is that a very good friend, an officer and colleague, classmate was murdered in the line of duty. We try to remember him every chance we get.”

Clay Carpenter also went into law enforcement.

He has a blog about his dad, the day of the murder and how he handled the grieving process. He hopes he can help others who are going through something similar.

Here's a link to his blog: