A cooker and smoker apparatus for an outdoor grill is comprised of a plurality of louvers that are pivoted between a first position where the louvers overlap each other and a second position where the louvers are oriented uprightly relative to each other for the respective indirect and direct cooking of food supported on a cooking grate of the outdoor grill. The cooker and smoker apparatus provides for smoking of the cooking food in both modes of operation. Additionally, the cooker and smoker apparatus is provided with a simplified construction that reduces the cost of its manufacturing and enables the apparatus to be a part of an outdoor grill as it is manufactured or to be retrofit to an existing outdoor grill.