The ex-Pop Idol star was found in his US apartment in Rochester, Minnesota last summer.
An autopsy report later revealed that the singer died accidentally as the result of ‘toxic effects of chloroethane’ which had been inhaled, with suffocation also cited to have contributed to his death.
Local police added at the time that there were ‘no signs of intent or suspicious circumstances’.
Now, his girlfriend Lauren Cheek has said that Danesh Campbell’s autopsy showed his heart swelled to twice its normal size.
He also had a broken neck as a result of a car crash in 2010, which he never got checked out.
‘Darius was living with this heart condition that he didn’t know he had,’ the American businesswoman said.
She added to The Sun: ‘So many things could have taken him, but this one thing did, and he died in his sleep.
‘His mum told me they only found out after they did the autopsy. His heart was twice the size it was supposed to be, which was fitting, because that is genuinely how he was — he had so much love.’
Cheek added that the recurring pain caused by Danesh Campbell’s neck injury is what caused him to use chloroethane as a painkiller.
The 30-year-old said: ‘He didn’t want to take pills, not even aspirin.
‘That’s what killed him — the substance mixed with his heart and he couldn’t take it.’
The Colourblind singer’s relationship was only revealed following his death when Cheek shared a heartfelt tribute.
Sharing a series of photos to Instagram, his grief-stricken partner wrote: ‘My best friend, my love, my soul mate – and now my angel ???? Nothing can put into words the pain and shock I’m feeling without you ???? It still just doesn’t feel real ???? i love you forever & ever.’
According to a friend of the late star, Chris Cochran, Danesh Campbell and Cheek were ‘old friends’.
As well as his girlfriend, Danesh Campbell left behind two brothers: Arias and Cyrus.
Honouring their late sibling after their tragic loss, the pair wrote: ‘Brother, We will miss you so much. You were a supernova star, shining light and love to so many. It was the greatest privilege to be your brother for all these years.
‘While your earthly presence has passed, your spirit will forever be with us. We will celebrate and love you, always. Until we meet again, Aria & Cyrus.’
Danesh Campbell’s funeral was held in Scotland after his death, with close friend Gerard Butler among mourners attending.
His life and career have since been celebrated in many ways, with the Olivier Awards honouring him alongside the likes of Paul O’Grady in their In Memoriam segment.
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