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Her family wasn't happy with her 2012 letter to El Chapo.

In 2012, Kate aired her feelings about the Mexican government, Catholicism, and El Chapo in a controversial tweet. At the time she wrote, “Today I believe more in El Chapo Guzmán than I do in the governments that hide truths from me, even if they are painful, who hide the cures for cancer, AIDS, etc, for their own benefit. Mr. Chapo, wouldn’t it be cool if you started trafficking with the good?”
Her dad, Eric del Castillo, defended her publicly, but critiqued her line-by-line in an email. Her sister, Verónica del Castillo, reminded Kate that she and Teresa Mendoza, the drug trafficker she portrayed on La Reina del Sur, were two different people.
Kate, in the meantime, just wanted everyone to chill. “I was so upset,” she said. “You know, why are they crushing me? I’m not saying all of this is true. This is just what I believe.”