Ademir Oliveira Rosário

His trial began in March 2012. During the proceedings, Oliveira claimed that he "wanted to have an affair" with the younger brother, claiming that he had completely blacked out when Josenildo refused his advances on him. He also denied raping and killing Francisco, pinning it completely on Messaggi. Due to this, his attorney, Marcos Figueiredo Martins, pleaded with the judge to have his client acquitted on the grounds of insanity and thereafter transferred to a mental health institution, arguing that he could not possibly have been in a stable mind when he had committed the murders.

In a rebuttal to that assessment, prosecutor Eduardo Campana pointed out that the psychiatric reports indicated that Oliveira was sane at the time of the crimes and thus fully culpable for his actions. In the end, he was found guilty on two counts of rape and murder, and was sentenced to 57 years imprisonment. For his alleged role in the crimes, Messaggi had already been convicted for participating in Josenildo's death in 2009 and was sentenced to 31 years imprisonment, but has continued to appeal the sentence, professing his innocence.

In the early 2000s, Oliveira was transferred to a psychiatric hospital in Franco da Rocha, where he was eventually given permission to leave on November 25, 2006. After his release, he moved back to São Paulo and got into a relationship with Elson José Messaggi, a homosexual pai-de-santo who had been diagnosed with HIV since 1997. Like Oliveira, Messaggi was attracted to teenagers aged 14 to 15, whom he often lured to nearby forests with offers of sex in exchange for candy and soft drinks.

By the early 1990s, he started doing criminal activities, beginning with a conviction for theft in 1990. The following year, Oliveira killed a man during a dispute, but was acquitted on the grounds of insanity and sent to a psychiatric hospital in Taubaté. Despite being diagnosed as a dangerous sexual predator, he was lodged into a semi-open regime that allowed him to go on the outside. During one such outing in 1998, he assaulted two boys and committed a robbery and was again returned to the hospital, but no stricter regime was imposed on him.

Ademir Oliveira Rosário (born 1971), known as The Cantareira Maniac (Portuguese: Maníaco da Cantareira), is a Brazilian serial killer and serial rapist who gained notoriety for murdering two teenagers in 2007. The crimes were committed after his release on probation from a psychiatric clinic, where he had been interned for a 1991 manslaughter conviction and other charges. For the latter crimes, he was convicted and sentenced to 57 years imprisonment.

Born in 1971 in São Paulo in a family with seven other siblings, Oliveira's childhood was described as reportedly normal, despite being born deaf and mute. However, according to one of his sisters, he started to exhibit unstable and bizarre behavior as a teenager, but did not cause any major disruptions to his family members.