Holly Hagan has shared new heartbreaking details about her sister's death from an accidental drug overdose aged just 19.

Darci died after taking crystal MDMA in a Manchester nightclub. She was partying with friends when she poured the powdered MDMA into her drink - and was unaware of how much she had consumed. She then fell ill and was "apologising for ruining everyone's night" but recovered enough to go back to the dance floor and take videos.

But Holly then said Darci started getting "really paranoid" and stopped recognising people before screaming and collapsing. She suffered a cardiac arrest followed by multiple organ failure.

Recalling the moment Darci passed away in hospital, the 33-year-old said it was the "worst day of our lives".

• Holly Hagan reveals text she wished she sent her sister on night of tragic drug death

• Heartbroken Holly Hagan says she's plagued with guilt over sister Darci's death at 19

However, she added that 'something good' came of their loss after they family donated her heart and helped save the life of a stranger. Speaking with Paul C. Brunson on his podcast We Need To Talk, the Geordie Shore star described it as a "selfish decision", explaining that they wanted her life to "mean something" and say that she'd saved a life.

She said: "We wanted her to have achieved this, and for us to feel better because of it. I found out by letter, three weeks later, that she did save a life, and that she saved the life of a woman."

The star said it was "such an honour" and added: "As awful as the situation was, I'm so proud of her and she's achieved more in her short 19 years than many others will achieve. And I'm so happy that the day that that woman got that call will have been the happiest day of her life. And it was the worst day of ours. But something good came of it. And someone's children didn't have to lose their parent."

Holly, who is pregnant with her second child, then shared the "weirdest" part about the organ donation. "Darci had a tattoo under her ribs here, so on her heart, and it said, ‘live where your heart finds life.’ And that's such a strange tattoo for a 19-year-old to get. Live where your heart finds life. And that was the only organ that she was able to donate," she said.

She now hopes her younger sister is hopefully "living where her heart has found life" but still "cannot accept that she's gone". Calling the drug overdose a "silly mistake", she said that her sister was not "reckless". Recalling the fight to save her life, she previously said: "She [went] into cardiac arrest. They've got her back within a minute. Got straight in the ambulance and on the way to Manchester Royal Infirmary. She was there in probably less than seven minutes, very quick.

"She went into cardiac arrest again in A&E, but they got her back with chest compressions. And then at that point obviously they're realising her temperature’s sky high, her muscles are all spasming, which releases potassium, sodium, all of the stuff. Her kidneys are being poisoned.

"So all of that stuff is happening behind the scenes while they're just trying to keep her alive. So they've cooled her, they've put her on dialysis, she's got all the tubes. And obviously at this point, I don't know any of this." She then said her phone had been on silent so hadn't got to the hospital until the early hours of the morning but said: "I don't think I will ever be able to wipe the screams of my mother from my brain."

Holly was incredibly close to her sister and told her followers and opened up about a 'red flag' before Darci's death. Saying she wished she had reached out to Darci before she went to clubbing at the Warehouse Project, she added: "For some reason that night and I don’t know why I didn't, I wish I had messaged her, because we know what Warehouse Project is.

"I don’t know why I didn't think to message her to say what you doing tonight, let me know what you’re doing tonight, let me help guide you. Because for some reason this night she decided to order, not a pill, but powdered MDMA. And as far as everyone knows and talking to her friends, this is the first time she'd ever taken it.

"She went out this night and she had one alcoholic drink and then from what her friends said she poured an amount from the bag into her drink."

Praising the paramedics for getting Darci to Manchester Infirmary as quickly as possible, Holly revealed her heartbreaking last moments with her little sister.

"To see my sister, just 19, lying in that ward was absolutely horrendous," the heartbroken sister told the Daily Mail. "I opened the curtain, and I have never seen anything like that in my life. I hope no parent or sibling ever has to see anything like that.

"She had tubes in her nose, in her mouth, she had bruises everywhere from where they had cannulas wherever they could put a cannula, she had tubes, needles in her neck, she had blood pouring out of her nose."

Holly then revealed that a scan confirmed that Darci was brain dead, and there was nothing more doctors could do for her. Sharing her heartbreaking final act for her sibling, the mum-of-one said she went out in the middle of the night to buy pyjamas for her sister before making sure that her hair - including £800 extensions - was brushed 'so that my mam wouldn't see any knots'.