Nurse Simonne Kerr, 31, shot to fame on the ITV talent show as part of the NHS choir B Positive.
This evening Scotland Yard said Desmond Sylva, 40, had been charged with her murder. He will appear before magistrates in Wimbledon tomorrow morning.
A Britain's Got Talent spokesman said: “We are deeply saddened and shocked to hear that Simonne Kerr has died. Our thoughts and condolences are with Simonne’s family and friends during this difficult and devastating time.”
On Wednesday armed cops smashed down her door after a 999 call but despite the efforts of paramedics she was pronounced dead at the scene in Battersea just after 1.40pm on Wednesday.
The death of Ms Kerr, whose son Kavele died from sickle cell disease in 2015, is the 90th homicide investigation in the capital this year.
B Positive — made up of staff, donors and patients from the NHS Blood and Transplant unit — was founded to inspire the public to give blood.
They made it through to the final of Britain's Got Talent this year after heartrending performances moved judges Amanda Holden and Alesha Dixon to tears.
The group was a wildcard entry to the final — eventually losing out to comedian Lost Voice Guy.
Mum-of-two Simonne worked as a haematology and oncology nurse at Guys and St Thomas Hospital in South London.
She was killed in her flat in the affluent "Nappy Valley" area of the capital — which is popular with young families.
Witnesses said armed police broke down the door of the end of terrace property, which was later cordoned off.
A neighbour who didn’t want to be named said: “The police went in with a battering ram at 12.40pm.
“Armed officers took him out a minute or so later and had him sitting in an unmarked Astra.
“He was very calm when they took him away – they didn’t need to put him on the floor or anything.
“It’s just shocking. It’s a shock to the system and a very sad outcome.
"There are lots of kids and young mums round here, it’s very Nappy Valley and Yummy Mummy territory.”
Police reassured residents, telling them: "It's not gang-related."
Simonne 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.
Kavele's father was screened and discovered that he was also a carrier for the disease as well.
At the time of the competition Simone, originally from Wembley, said: "Knowing both myself and Kavele's dad were carriers of the sickle cell trait meant that my baby would have a one in four chance of developing the condition.
"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."
Telling of the trauma of her son's death, Simonne said that he woke at 5am with a high temperature and vomiting.
She 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".
The brave mum managed to turn her heartbreaking ordeal into something positive — channelling her grief into raising awareness of sickle cell disease and blood donations with B Positive.
She said: "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 life into adulthood. I lost him in 2015."
Simonne added: "Singing can be such an uplifting experience so joining the B Positive choir seemed the obvious way to raise awareness of the urgent need for more young and black people to give blood while doing something positive and motivational."
The talent star also appeared in an NHS appeal to urge others to give blood, where she spoke about the tragic loss of her son.
In the moving one-minute clip she said: "My son's name was Kavele, and Kavele was a very lively boy – loved dancing and was in year two of Leopold Primary school when he passed away.
"So, joining B Positive choir was an opportunity that I was really excited about. It was all about raising awareness, not only for sickle cell, but also the need for blood.
"It's really important that you've done something good for someone."
The Met’s Homicide and Major Crime Command are leading the investigation into her death.
A statement from Scotland Yard said police are not looking for anyone else in connection with their investigation — and a post-mortem was due to take place today.
Anyone with information is asked to call police on 101 quoting CAD 3183/15Aug or Crimestoppers anonymously on 0800 555 111.
More to follow…
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