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When Davina McCall 's sister Caroline collapsed in front of her in 2012, the distraught Masked Singer judge thought she had suffered a stroke.
Davina, 53, immediately phoned an ambulance and a stroke car was sent to Caroline's cottage – next door to Davina's own home.
But after failing to pinpoint the problem, Caroline, 50, was taken in for tests and tragically found to be suffering from terminal lung cancer that had spread to her brain and bones.
For Davina and her family, the news was absolutely crushing.
"We were in total shock. I couldn't breathe, trying to be strong for Caroline. But she was the strong one," Davina previously told the Daily Mail.
Davina McCall and her sister Caroline were so close that they lived next door to each other
(Image: Collect Unknown)
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Caroline spent the next month on the ward before returning home, where Davina and her family selflessly dedicated themselves to her care.
Sadly, Caroline died just three weeks later, and looking back, Davina said she harbours a huge amount of regret for not noticing the symptoms, like Caroline's weight loss and the forgetfulness she blamed on the menopause.
Admitting she 'kicks' herself, the star said: "The traumatic diagnosis was all the worse because it came out of the blue. Yes, Caroline smoked with impunity, yes she'd had a cough for as long as we can remember, but neither of us saw this as a warning sign.
"She was getting quite clumsy, which we now know was because her peripheral vision had disappeared. The pain in her back we thought was from a fall she'd had when we were working in the garden. Now I know these were all signs. I look back and wonder if I could have done something differently – it's the greatest regret of my life."
Caroline was diagnosed with terminal lung cancer after collapsing at home
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Davina added that without the kind words of one nurse who was on duty that horrible day, she would have fallen apart.
Feeling like she was 'going mad', the former Big Brother host went outside to cry alone and suddenly felt the kind hands of the nurse rubbing her back.
Confiding that she 'couldn't breathe', the nurse soothingly told her to have a good cry and then get herself together and go back inside to support Caroline.
Davina said she will 'never forget' how the nurse knew exactly what she needed to hear when she was broken.
She previously revealed how brave her sister was in her final days, and how she now no longer fears death herself.
“[Caroline] was unbelievable. There was something about her acceptance of death, her willingness to say ‘I’m not going to freak out and fight it and make you feel scared,'" Davina told This Morning in 2016.
“I know she was doing it for us – she was so brave. I’d see her pulling it out of the bag for her friends to make them feel better when she was so exhausted.”
* The Masked Singer continues on Saturday night at 7pm.