The mother of teenage actor Archie Lyndhurst has revealed he died from a brain haemorrhage while he slept at his family home in west London.
An inquest into the 19-year-old's death on September 22 was abandoned last week after a coroner ruled it was not necessary.
The teenager, who had been acting since the age of 11 and was son of Only Fools and Horses star Nicholas Lyndhurst, starred in the hit CBBC show So Awkward as Ollie Coulton and was dating co-star Nethra Tilakumara.
His mother Lucy Lyndhurst has now told how Archie had died in his sleep after an intracerebral haemorrhage caused by acute lymphoblastic lymphoma/leukaemia.
The condition is rare and kills just 800 people a year. Archie had no signs of illness before his death his family said.
Mrs Lyndhurst and her husband Nicholas Lyndhurst, 59, found out the details from his second post mortem just four days before Christmas.
Posting on Instagram, she wrote: "He died from an Intracerebral Haemorrhage caused by Acute Lymphoblastic Lymphoma/Leukaemia.
"This is not Leukaemia as we know it, the word Acute in medical terms means rapid. He assured us that there wasn't anything anyone could have done as Archie showed no signs of illness.
“Archie had numerous bleeds on the brain and the Dr went to great lengths to reassure us that he wouldn't have been in any pain as it happened in his sleep.”
Mrs Lyndhurst also shared pictures of Archie as a young child and pictures of him with Nethra, who she called 'the love of his life'.
Paying tribute to her only son, she said: "The world is a very different place without him. One of my last conversations with him was about all that was going on in the world, the chaos, anger about all different subjects.
"He looked at me with his huge blue soulful eyes, shook his head and said 'All the world need is love Mama, it's so easy to love'.
"He loved life, he valued everyone in it and every moment he was given. He was always singing, and had such energy and passion in everything he did.
“To be part of his life has been the biggest joy mad honour. We miss him everyday and always will.'”
Police were called 'to a report of a concern for welfare' on September 22 and the young actor was declared dead at the scene. His death was treated as “unexplained but not suspicious”.
The family said that he had been laid to rest in a “tiny chapel” in November.
Posting on Instgram his mother wrote in November: “Nick and I shall be with him in a tiny chapel to send him on the first part of his next journey.”