Big Brother 9, also known as Big Brother: 'Til Death Do You Part, is the ninth season of the American reality television series Big Brother. It is based upon the Netherlands series of the same name, which gained notoriety in 1999 and 2000. Big Brother 9 is the first season of the series to air in the Winter time period, due to a writer's strike. The series premiered on CBS on February 12, 2008 and lasted eleven weeks until the live finale on April 27, 2008. The ninth season saw a decrease in ratings when compared to past editions of the series. The season premiered to a total of 7.33 million viewers, the lowest premiere numbers for any season at the time. Overall, the series averaged 6.56 million viewers, making it the lowest rated season of the series at the time. Big Brother 9 was the fi