A state trooper stopped to help after a road crash in Colorado. He was hit by a vehicle and killed

Colorado State Trooper William Moden was killed by a vehicle along the interstate, the agency said.

(CNN)A Colorado State Patrol trooper was struck by a vehicle and killed Friday night while investigating a crash, the police agency said.

William Moden, 37, was at the scene of a wreck on eastbound Interstate 70 when he was hit, the state patrol said in a news release. He was taken by helicopter to the University of Colorado Hospital in Denver, where he died.
The crash is under investigation, the agency said.
"Trooper Moden had a big heart and he loved his family and loved being a State Trooper," said Col. Matthew Packard, chief of the state patrol. "All he wanted to do was make a difference."
    "Our hearts are heavy and he will be sorely missed," the agency tweeted.
    Moden was a 12-year veteran of the Colorado State Patrol, the agency said.