Former "Saturday Night Live" cast member Devon Walker told Variety on Tuesday why he felt the show was "toxic" after posting a controversial Instagram message about leaving the series last week.Walker was the first of several cast members to announce their departure from the NBC sketch comedy ahead of its 51st season. He wrote in his farewell message that while the show was "really cool," it was also toxic and marked by "dysfunction.""Me and the show did three years together, and sometimes it was really cool. Sometimes it was toxic as hell. But…we made the most of what it was,
