WEST DES MOINES, Iowa — A college economics professor was arrested Wednesday after police in a Des Moines, Iowa, suburb say she bound and gagged her husband for hours, leading to his death.Gowun Park, 41, was charged with first-degree murder and first-degree kidnapping in the death of her husband, Sung Nam, also 41, West Des Moines police said.Simpson College, a private liberal arts college based in Indianola, Iowa, identified Park as an assistant professor of economics.