The announcement was made at the end of Sunday night's "Mythbusters" episode, but it was clearly known to everyone involved with the show for a long time prior. In fact, as soon as word officially got out, Kari took to her Twitter to open up and say goodbye in a lengthy correspondence ?
I guess you guys are finding out the news right about now. After a decade of the MythBusters, we are no longer with the show. Thank you to all the fans who have supported us. The show is taking a new direction. It was an amazing run. I learned so much about myself and the world. I love you all @MythBusters. I am sad for an ending but there will be exciting new adventures for us."