65-year-old Thomas Kovalik was pronounced dead at Charlotte Hungerford Hospital in Torrington, Connecticut.
"Knutson was the jilted lover and... set the clerk's Harley on fire," local police alleged.
"If I get a T-shirt made in the USA, it's going to cost about $8 more."
Canada will begin to impose tariffs on U.S. products on July 1.
President Donald Trump accused Harley-Davidson of surrendering in his trade war.
Citing the high costs of new tariffs, Harley-Davidson announced Monday it would move some of its United States motorcycle production abroad.
One year ago, President Donald Trump pledged to help Harley-Davidson expand. Last week, he announced steep tariffs that threaten the company on two fronts.