Woman poisoned mother with insulin and smothered her to death
Shirley D’Silva pleaded guilty to manslaughter (Picture: Met Police)

A woman poisoned her elderly mother with insulin before smothering her to death with a pillow.

Shirley D’Silva, 55, wept as she pleaded guilty to the manslaughter of her 77-year-old mother Martha Pereira at their home in Croydon, south London.

The Old Bailey heard how D’Silva called 999 and told operators how she carried out the act.

An operator took a call at around 4.10pm on 25 October last year.

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D’Silva then told the person at the other end of the line that she had just killed her mother.

When the operator asked what happened, she said: ‘Erm, nothing happened. I just decided to take her life.’

The operator then asked, ‘What made you do this today?’

The daughter then said: ‘It’s the world we live around. We’ve been suffering too long. Nobody’s doing nothing about it. Somebody has to come forward and do something about it.’

Woman poisoned mother with insulin and smothered her to death
She poisoned her mother with insulin (Picture: Eye Ubiquitous/UIG via Getty Images)

She added that her mother had been unwell for some time.

Later on in the call, the operator asked her: ‘Did you do it because you don’t think you were getting the help you needed?’

D’Silva insisted this was not the case and said: ‘It’s about the world, the war around the world going on.’

She then remained on the phone until officers arrived at the scene.

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D’Silva then told police officers: ‘I have just killed my mother. I have given her an overdose of insulin and I have suffocated her with a pillow.’

Paramedics tried to carry out CPR on the elderly woman, but she was pronounced dead a short time later at a south London hospital.

Today, D’Silva, who has a history of paranoid schizophrenia, cried as she pleaded guilty.

Judge Nicholas Hilliard, QC, said: ‘So we are all agreed that’s not guilty to murder, but guilty to manslaughter on the grounds of diminished responsibility.’

Prosecutor Oliver Glasgow, QC, said the plea had been accepted because experts were agreed that D’Silva has ‘substantial impairment’.

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The court heard that D’Silva claimed to have received messages telling her to harm other people.

Judge Hilliard adjourned sentencing until tomorrow morning and said: ‘Ms D’Silva, that’s all that’s going to happen today, alright?

‘You will just go back to the hospital where you have been and come back tomorrow.

‘All being well, everything will be dealt with then.’

D’Silva, of Addiscombe, south London, is expected to be detained under sections 37 and 41 of the Mental Health Act.