Paramedic Says 'Yes' to Cop's Proposal Caught on Dash Cam

The future bride told ABC News she was in "total shock."

— -- With the help of another officer, a South Dakota cop pulled off a surprise proposal to his firefighter and paramedic girlfriend in a sweet moment caught on dash cam video.

The Rapid City Police posted video of the April 27 proposal to Facebook, showing Rapid City Police Officer Nick Allender's partner initiating a traffic stop for Allender's girlfriend, Rapid City Firefighter and Paramedic Sarah Stewart.

Stewart gets out and walks back to the patrol car, shocked to see her boyfriend waiting there. The partner then hands Allender the ring box for the big moment:

Stewart, 22, told ABC News she was in "total shock."

"I knew the engagement was coming ... we had talked about it ... but I had no idea that it would be like that," she said. "I honestly thought I was just being pulled over.

"And then I saw Nick get out... and it was when I saw the ring box... then I knew what was happening," she said.

Allender, 23, told ABC News he thought involving his police department in his "once in a lifetime" moment was "unique, and something that I could do that was different than anyone else."

But the future groom says he wasn't nervous about Stewart's answer.

"We've been talking and contemplating it for a while so I knew she was going to say 'yes,'" he said.