sentences:  Hayes, who lived and hosted a radio show in New York during his tenure with "South Park", would record his dialogue on a digital audio tape while a respective episode's director would give directions over the phone, then the tape would be shipped to the show's production studio in California.After Hayes left the show in early 2006, the character of Chef was killed off in the season 10 (2006) premiere "The Return of Chef".Celebrities who appear on the show are usually impersonated, though some celebrities lend their voice to their characters.