29th Annual GLAAD Media Awards - Arrivals"Roseanne" after the show's star, Roseanne Barr, posted a racist tweet about former presidential advisor Valerie Jarrett.



Sykes announced her decision to leave the hit ABC sitcom on Twitter:





The move comes after Barr sparked outrage by tweeting a racially-charged remark about Jarrett, former advisor to President Barack Obama, that referenced "Planet of the Apes" and the Muslim Brotherhood.



After coming under fire, Barr apologized, saying it was a bad joke, and also indicated she would delete her Twitter account:





Many are calling for ABC to cancel the show and stop giving Barr a platform for her views:




Sykes' departure would be the second major exit from the show's staff; last week, Whitney Cummings stepped down as co-showrunner, citing scheduling conflicts.