The accident occured on the Interstate-82 about 6 miles east of Prosser, Wash., and just west of Washington’s Tri-City area, KSL.com reported.
In an August Facebook post, Moffat celebrated their union.
“Stephen and I, in joyful disbelief, united our lives together and became husband and wife,” she wrote in the post. “I can’t tell you how much I love this man.”
“For now our marriage is until death do us part,” Moffat wrote.