Desmond Sylva appears in court after Battersea murder of Britain's Got Talent ...

A man has appeared in court charged with the murder of a nurse who performed on Britain’s Got Talent in an NHS choir.

Desmond Sylva, 40, is accused of stabbing 31-year-old Simonne Kerr to death in her home in Battersea, south-west London.

Police were called shortly before 12.40pm on Wednesday to the Victorian terrace but she was pronounced dead at the scene despite the efforts of paramedics.

Sylva, who lived in the same address in Grayshott Road, appeared at Wimbledon Magistrates’ Court today charged with murder.

He did not enter a plea to the charge and spoke only to confirm his details during the short hearing.

He was remanded in custody and ordered to appear on August 21 at the Old Bailey. 

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Simonne Kerr (pictured with her six-year-old son Kavele died from complications arising from sickle cell disease in 2015) was stabbed to death yesterday

Simonne Kerr (pictured with her six-year-old son Kavele died from complications arising from sickle cell disease in 2015) was stabbed to death yesterday

The 31-year-old wowed audiences on ITV after appearing on Britain's Got Talent as part of the NHS choir B Positive, created to raise awareness for blood donations

The 31-year-old wowed audiences on ITV after appearing on Britain's Got Talent as part of the NHS choir B Positive, created to raise awareness for blood donations

Ms Kerr wowed audiences on ITV after appearing on Britain's Got Talent as part of the NHS choir B Positive, created to raise awareness for blood donations.

The group of NHS nurses and doctors left BGT judges Amanda Holden and Alesha Dixon in tears earlier this year with their powerful rendition of the single Rise Up.

A spokeswoman from NHS Blood and Transplant said: 'Our thoughts and condolences are with Simonne’s family at this tragic time.

'She was a valued and respected member of the B Positive choir who was passionate about the lifesaving power of blood donation following the loss of her son.

'The choir, NHS Blood and Transplant and all those who knew Simonne are devastated at the loss of a well-liked choir member and friend.'

Ms Kerr previously revealed how she took solace in the choir following the death of her son Kavele, six, from sickle cell disease, an inherited blood disorder, in 2015.

Simonne Kerr died on Wednesday despite the efforts of paramedics who battled for more than an hour to save her

Simonne Kerr died on Wednesday despite the efforts of paramedics who battled for more than an hour to save her

She was pronounced dead yesterday in the Victorian terrace flat she was staying in,  despite the efforts of paramedics who battled for nearly an hour to save her. 

Sylva was arrested on suspicion of murder at the scene, sparking the 90th homicide investigation in the capital this year.

Simonne, who worked as a nurse at Guys and St Thomas Hospital in south London, joined the choir after her son passed away.

She discovered she was a sickle cell disease carrier during a routine 12-week pregnancy scan and Kavele was diagnosed at only five days old after a heel-prick test. 

At the time of the competition, Ms Kerr said: 'Kavele was diagnosed with sickle cell disease at birth. He had his first sickle at just a few months old.

'The sickling happened mainly in his tummy and as he got older, he was hospitalised one or two times a year, usually for a few days at a time.

'Kavele was an active child and he went to school and led as normal a life he could with sickle cell disease.'

When Kavele was six years old, he came home from school one day feeling fine and went to bed at 8.30pm as usual.

But at 5am the following day, he awoke with a high temperature and vomiting. 

Kerr worked as a nurse at Guys and St Thomas Hospital in south London. Just a few months before her death, she was pictured with Collette from the Kingdom Choir, who sang at the Duke and Duchess of Sussex's wedding

Kerr worked as a nurse at Guys and St Thomas Hospital in south London. Just a few months before her death, she was pictured with Collette from the Kingdom Choir, who sang at the Duke and Duchess of Sussex's

The group of NHS nurses and doctors left BGT judges Amanda Holden (pictured) and Alesha Dixon in tears with their powerful rendition of Rise Up

The group of NHS nurses and doctors left BGT judges Amanda Holden (pictured) and Alesha Dixon in tears with their powerful rendition of Rise Up

Alesha Dixon (pictured) was brought to tears by the performance of the choir earlier this year

Alesha Dixon (pictured) was brought to tears by the performance of the choir earlier this year

The B Positive choir posted this message on social media hours before they performed in front of the BGT judges in May 

The B Positive choir posted this message on social media hours before they performed in front of the BGT judges in May 

Ms Kerr (pictured) previously revealed how she took solace in the choir following the death of her son Kavele, 6, from sickle cell disease, an inherited blood disorder, in 2015

Ms Kerr (pictured) previously revealed how she took solace in the choir following the death of her son Kavele, 6, from sickle cell disease, an inherited blood disorder, in 2015

Ms Kerr was pronounced dead yesterday in the Victorian terrace flat she was staying in, despite the efforts of paramedics (pictured: her body is removed from the home)

Ms Kerr was pronounced dead yesterday in the Victorian terrace flat she was staying in, despite the efforts of paramedics (pictured: her body is removed from the home)

Forensic investigators were pictured scouring the scene for evidence today. Scotland Yard said detectives are not looking for any other suspects

Forensic investigators were pictured scouring the scene for evidence today. Scotland Yard said detectives are not looking for any other suspects

Ms Kerr said: 'I gave Kavele medication and monitored him throughout the morning. 

'However, he became more lethargic and I felt his condition was not improving so I called for an ambulance and was told we would have to wait up to 45 minutes.

'An hour later I telephoned 999 again because Kavele's breathing became more laboured.

'Kavele went into cardiac arrest approximately 20 to 30 minutes after several ambulance crews started to arrive. He did not recover and passed away in hospital several hours later.'

Ms Kerr said she joined the B Positive choir because she is passionate about raising awareness of blood conditions and the need for more blood donors.

She added: 'I got to spend six wonderful years watching Kavele grow and though there were a handful of hospitalisations in his short life, I was positive that he would live a full

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