Paula Josette Arizona, 23, died in January after entering a Hermosillo prison to see a prisoner. For the authorities it was a sudden heart attack, the family denounces a murder.

EL PAÍS accesses the judicial file and analyzes the case with experts. So far there are seven people charged, all of them free on bail. The suspicious death of Paula Josette raises more questions than answers about what could have happened to her, especially since she was supposedly under the protection of authorities in a state prison.