Nicola Haseler
BBC News, Bedfordshire
Reporting fromLuton Crown Court
Harriet Heywood
BBC News, Bedfordshire
Contributed
Juliana Falcon, 48, Kyle Prosper, 16, and Giselle Prosper, 13, were found dead at their home
A 19-year-old man has admitted shooting dead his mother and two siblings in their flat.
Juliana Falcon, 48, Kyle Prosper, 16, and Giselle Prosper, 13, were found deceased at their home on the Marsh Farm estate in Luton on 13 September.
Nicholas Prosper, of Leabank in Luton, pleaded guilty to three counts of murder at Luton Crown Court on Monday.
He also pleaded guilty to purchasing or acquiring a shotgun without a certificate, possessing a firearm with intent to endanger life and possessing an article with a blade or point.
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Prosper answered guilty to all six charges at Luton Crown Court
An inquest at Bedford Coroner's Court in October heard that all three of the victims died from gunshot wounds to the head.
Officers were called to the flat in Leabank, off Wauluds Bank Drive, at about 05:30 BST.
Speaking previously Det Supt Rob Hall, from the region's major crime unit, said officers who arrived at the scene were "met with such awful circumstances".
He was arrested shortly after and a firearm was found during a search of the surrounding area.
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Flowers and cards were left at the entrance to the Leabank block of flats shortly after the murders
Shortly after the murders, Cardinal Newman Catholic School in Luton said it was "deeply saddened" by their pupil Kyle's death.
"This is devastating news to all those who knew and loved Kyle and it will take some time to come to terms with the profound sense of loss," the school said.
A statement on X from Jess Pather, the head teacher at Lea Manor High School in the town, said the school was "deeply shocked" by Giselle's death.
It added: "Giselle was a beautiful soul and a model pupil.
"She excelled in all her subjects and will be sorely missed, particularly by her friends in Year 9."
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Police said they found the victims in "such awful circumstances" at the Leabank block
Prosper is on remand at HMP Peterborough, but he appeared for the hearing which lasted less than 10 minutes.
He wore a black t-shirt, dark trousers and black rimmed glasses as he entered his pleas.
Prosper sat with his arms folded when he entered the dock, but stood up as he answered guilty to all six charges.
He is due to be sentenced on 5 March.