Cassill tweeted the news of his marriage, along with a picture, following the ceremony.
"Here we are! Newlyweds! Me and my beautiful new wife," tweeted Cassill. "I'm so excited about everything that's in store for 2013. It's already off to a great start."
Cassill finished in championship points in 2012, the first season for the start-up BK Racing team. He recorded a season-best finish of 18th (three times) for a team that did not open its doors until late January.
BK Racing has yet to announce its driver lineup for 2013.