why did roseanne leave the show

Roseanne Barr left the show because she was fired after posting a series of racist tweets, including one about former Obama advisor Valerie Jarrett. As a result of these tweets, ABC promptly canceled the hit revival of "Roseanne" in 2018. Following her dismissal, the show was retooled as a spinoff called "The Conners," which continued without her character by revealing that Roseanne Conner died offscreen from an opioid overdose. This decision was made to separate the show from Barr's controversial actions and allow the series to continue successfully without her involvement.