From E Online -

"It's the end of an era for MythBusters: Kari Byron, Tory Belleci and Grant Imahara are leaving the series. Adam Savage and Jamie Hyneman announced the fan-favorites would depart the show at the end of the Thursday, Aug. 21 episode of the hit Discovery program.

Kari and Grant took to Twitter to share their feelings with fans after the announcement."