Hayden Panettiere once wrote in her memoir that working on 'Nashville' was like diving 'headfirst into my own hell'

Panettiere was open about her mental health struggles and addiction, as was her "Nashville" character, Juliette Barnes. Mark Levine/Disney General Entertainment Content/Getty Images Hayden Panettiere died on August 16, three months after publishing her memoir, "This Is Me." In it, she wrote about…