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The actress announced on her Instagram Story on Wednesday that she will not be returning to the HBO series ahead of its third season.
As the second season aired, rumours of conflict between Ferreira and the show's director, Sam Levinson, circulated.
Some viewers suspected the director purposefully reduced Ferreira's screen time.
"What's interesting about this season is that there are so many more eyes on it that even the news cycle has been so interesting to see," she told Insider in March.
"Sometimes, things take on a life of their own, and they're not rooted in the truth," she continued, "but it's OK because I know it's just out of passion and curiosity and all that good stuff."
"After four years of embodying the most unique and enigmatic character kat, I must say a tearful farewell."
During an interview with Entertainment Tonight in April, the actress discussed why her character was not as prominent in the show's second season.