Marcelo Costa de Andrade: The 'Vampire of Niteroi'
- Jun 18
- 3 min read
Marcelo Costa de Andrade, known as the 'Vampire of Niteroi', murdered 14 boys in the Brazilian state of Rio de Janeiro in 1991, in a case marked by deeply disturbed religious delusions. This account avoids graphic detail out of respect for the young victims.
His crimes, and the psychiatric questions they raised, made his one of the most unsettling cases in Brazilian criminal history and a difficult study in mental illness and responsibility.
Key Facts at a Glance
Full name: Marcelo Costa de Andrade
Born: 1967, Rio de Janeiro, Brazil
Known as: The Vampire of Niteroi
Active: 1991
Victims: 14 boys
Outcome: Committed to a psychiatric institution
A Troubled Young Man
Andrade grew up in difficult circumstances marked by poverty and abuse, and as an adult he became deeply involved in a fervent and distorted form of religious belief. His grip on reality was profoundly impaired.
These influences combined into a dangerous set of delusions that would drive the crimes he committed over a short but devastating period in 1991.
Delusion as Motive
Andrade later told investigators that he believed killing young children would send them straight to heaven, and that his actions were somehow righteous. His reasoning reflected severe mental illness rather than any conventional motive.
This disturbing rationale, combined with other delusional beliefs, set his case apart from killers driven by greed, anger or control, and made it a focus of psychiatric study.
The Victims
Over the course of 1991, Andrade targeted boys in the poor communities around Niteroi, near Rio de Janeiro. The youth of the victims made the case especially horrifying to the Brazilian public.
Out of respect for the children and their families, the details of the crimes are not recounted here. Their loss left a deep and lasting wound in the affected communities.
Arrest and Confession
Andrade was arrested in 1991, and once in custody he confessed to the killings, describing his delusional motives with a candour that disturbed investigators and psychiatrists alike.
His statements made clear the extent of his mental illness, raising immediate questions about how the justice system should respond to a defendant so detached from reality.
A Question of Sanity
Psychiatric evaluation found Andrade to be severely mentally ill, and rather than an ordinary prison sentence he was committed to a secure psychiatric institution. The decision reflected the conclusion that he was not criminally responsible in the usual sense.
His case became an important reference point in Brazilian discussions of the insanity defence and the treatment of mentally ill offenders who commit grave crimes.
Debates Over His Treatment
Over the years, the question of whether Andrade might ever be released generated controversy, given both the severity of his crimes and the nature of his illness. His case repeatedly tested the boundaries between punishment and psychiatric care.
It highlighted the profound difficulty of balancing public safety, justice for victims and the humane treatment of the seriously mentally ill.
A Haunting Brazilian Case
The Vampire of Niteroi remains one of the most disturbing cases in Brazilian criminal history, both for the number and youth of the victims and for the delusions that drove the crimes.
It endures as a stark study of how severe mental illness, left unrecognised and untreated, can have catastrophic consequences for the most vulnerable members of a community.
Justice and Mental Illness
The Andrade case forced Brazil to confront difficult questions about how the justice system should treat offenders whose crimes stem from severe mental illness rather than ordinary criminal intent. His commitment to a psychiatric institution rather than a prison reflected that distinction.
Over the years, debates about his condition and the possibility of his release kept the case in the public eye. It became a recurring reference in discussions about balancing public safety, the rights of the mentally ill and justice for victims, illustrating how such cases resist simple answers and demand careful, humane judgement.
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