Brenda Leigh Johnson will soon close her final case: The upcoming seventh season of The Closer will be the show's last, TNT announced Friday.Kyra Sedgwick, who won an Emmy for her role earlier this year."I cannot fathom how difficult it will be to say goodbye to the incredible family we've created on The Closer," Sedgwick said in a statement. "I will always be grateful to James Duff for his love and friendship, as well as for creating such a rich and complex character who I have loved living with year after year."The series became a brand-redefining breakout hit for TNT after its debut in 2005. It currently ranks as the top basic cable series of all time. The final season will consist of 15 episodes, including the show's 100th episode. Production is scheduled to begin in spring 2011.