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"The older I got—once I left my series, once I started to go for roles that weren't that age range—it organically began to become a project that I knew I would be behind the scenes with," Gomez tells The New York Times. "I actually like that I'm not in it."
Because the book "has such a huge following," she "wanted it to be credible."
"If I'm a part of it," Gomez explains, "that's going to cause a whole other conversation."
Thirteen Reasons Why tells the story of Hannah Baker, a high school student who kills herself and leaves behind cassette tapes describing the 13 people she blames for driving her to suicide.