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A man killed and decapitated his wife while suffering from a cannabis-induced psychosis that led him to believe she was possessed by a serpent and was going to kill him, two consultant psychiatrists have told the Central Criminal Court.
One of the psychiatrists said the accused man, Diego Costa Silva, believed that after attacking his wife, Fabiola Camara De Campos Silva, he had to remove her head to make sure that the serpent was dead.
Both psychiatrists agreed that Mr Costa Silva’s psychosis was not due to acute intoxication from cannabis, but a more persistent illness of cannabis induced psychosis. The court heard the accused continued to display psychotic symptoms 11 days after his arrest and detention.
Dr Brenda Wright and Dr Mark Joynt told the trial that cannabis induced psychosis is a mental disorder under the Criminal Law (Insanity) Act 2006.
They agreed that, as a result of his disorder, Mr Costa Silva did not understand the nature and quality of his actions and did not know that what he was doing was wrong.
Counsel for the defence and prosecution also delivered their closing speeches to the jury on Thursday, saying the evidence shows that, due to a mental disorder, Mr Costa Silva is not responsible for his actions and should be found not guilty by reason of insanity.
Mr Costa Silva (35) has pleaded not guilty to the murder of Ms De Campos Silva (33) on November 4th, 2021, at their home in Charlestown Place, Finglas, Dublin 11.
Psychosis
Dr Joynt was called by the defence and told Garnet Orange SC, for Mr Costa Silva, that he interviewed the accused three times, spoke to his sister in Brazil and read the book of evidence and other documents.
He said Mr Costa Silva’s sister told him that a number of members of their family had been diagnosed with bipolar disorder.
Dr Joynt said this family history puts Mr Costa Silva at a higher risk of developing a serious mental disorder, including substance induced psychosis.
He noted that two days prior to killing his wife, Mr Costa Silva had been taken to the Mater Hospital by gardaí who had a concern for his mental health. Doctors at the Mater asked Mr Costa Silva to remain as a voluntary patient, but he refused and left on November 3rd.
The notes taken by doctors at that time suggest that Mr Costa Silva was suffering symptoms of psychosis including confusion, thought disorder and a paranoid belief that his wife would hurt him.
Ms De Campos Silva was recorded to have told doctors that she noted a sudden change in her husband’s behaviour the previous Saturday, but she said he had not smoked cannabis for several days.
In his interviews with Dr Joynt, Mr Costa Silva said he had begun smoking cannabis at 16 and from the age of 20 would smoke daily. In 2020, he said his wife told him he was smoking too much, and he agreed to cut down.
He did not think he had smoked cannabis in the days immediately prior to killing his wife, the court heard.
Dr Joynt said that in the lead-up to killing his wife, Mr Costa Silva said he was convinced that she wanted to kill him and that he could hear voices external to his head.
He came to believe that his parents were being held by a gang and that his wife was possessed by the leader of the gang, in the form of a serpent.
He believed he was going to die and that he had to kill his wife to defend himself, the doctor said. After he attacked his wife, Mr Costa Silva believed “the serpent wasn’t dead, and he had to cut the head off to make sure it was dead”.
Following his arrest and detention, Mr Costa Silva continued to show psychotic symptoms until November 15th, 11 days after the killing. Two days after that, when Mr Costa Silva had spent five days taking the antipsychotic drug Olanzapine, he was reported to be improving and to have gained insight into his illness and what had happened.
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