She graduated from Fundação Getúlio Vargas and has dedicated herself to the study of criminal psychology,[1] especially related to serial killers.
She also wrote “O Quinto Mandamento – Caso de Polícia”, a book related to the 2002 murder of the Richthofen couple.
She was invited by the channel Fox Brasil to create a psychological profile of Dexter Morgan, the anti-hero and protagonist of Dexter, a popular American TV show.
Casoy also collaborated on Dupla Identidade, a series written by Gloria Perez and directed by Mauro Mendonça Filho.
The series also features Luana Piovani as a forensic psychologist police officer specialized in hunting serial killers.