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The Ex On The Beach star and his girlfriend Safiyya Vorajee had been sharing their little one's journey in recent months, as she battled a rare form the blood cancer.
She was sent home earlier in April to enjoy her last few days out of hospital, after doctors told the couple she had cancerous tumours running through her whole body, and there was nothing more they could do to treat her condition.
However, Ashley and Safiyya had to return to hospital with their daughter several times this month - once because her heart rate soared to over 200, and also for a platelet transfusion, after her condition deteriorated to the point where she was crying tears of blood.
More recently this week, she experienced seizures, stopped breathing, needed immediate oxygen as a palliative nurse attended the family home. Azaylia's parents were then told to prepare for their daughter's last days.
Sharing the news of her tragic passing, Ashley wrote on Instagram: "Rest In Paradise Princess :angel::rainbow:
I will always hold you in my heart until I can hold you again in heaven :heart::cry:"
He also shared a quote, reading: "She is proof you can walk through hell and still be an angel."
Safiyya also shared a heartbreaking post, writing: " You are my Angel my heartbeat my soul, RIP my precious baby, you will always be with me like a handprint on my heart."
As he broke the news, fans flocked immediately to offer their condolences, and share their tributes to the 'champ' - a sweet nickname Azaylia had been dubbed by her parents.
Reality TV favourite Ashley and Safiyya had been hoping to take their daughter to Singapore to undergo lifesaving CAR T-cell therapy for her leukaemia, even fundraising over £1.5 million from generous fans and celebrity pals to make the trip.
But they were then dealt a devastating blow, and told by the hospital that the treatment was no longer an option, because her cancer was so rare. This came after the Birmingham hospital she was being supported at also said her tumours were too advanced to treat.
"So last week we had the bone marrow test and the lumbar puncture and bloods taken to send to Singapore in the hope that they could create therapy to save Azaylia's life," Ashley told fans at the time.
"Then we had to have a CT scan on her head and the results came back the next day to say she's got two very big tumours on her brain.
"They also said that the chemotherapy that is usually given to treat leukaemia in the spine or the brain will not be available because she has too much pressure with these tumours.
"If they tried to go through the spinal tap it would kill her. At that point, our world came down."
The little one was given days to live towards the end of last week, but powered through until today.
The support for her has been immense in recent weeks, with the whole nation getting behind her story. A Clap For Azaylia was launched on Tuesday night, as a way to honour the little one, and show support for Ashley and Saffiya in their time of need.
As well as the general public, stars including Abbey Clancy and Peter Crouch, Stacey Solomon, Charlotte Dawson and Mrs Hinch all took to their doorsteps to honour her at 7pm.
Ashley had previously promised he would "be strong" for his daughter, as he wanted her to "see him smiling" before she passed.
RIP Azaylia. Our thoughts are with Ashley and Safiyya right now.
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