The former owner of a peanut company in Georgia was sentenced to 28 years in prison on Monday for his role in a salmonella outbreak that killed nine people and sickened hundreds, a rare instance of jail time in a food contamination case. Stewart Parnell, 61, who once oversaw Peanut Corporation of America, and his brother, Michael Parnell, 56, who was a food broker on the company’s behalf, were convicted on federal conspiracy charges in September 2014 for knowingly shipping salmonella-tainted peanuts to customers.