Grime star Ceon Broughton, 30, was convicted of manslaughter after giving Louella Fletcher-Michie the fatal dose of the Class A drug – filming her as she screamed “like an animal” and ate thorns.
Broughton had given six times the fatal dose of hallucinogenic 2-CP to Louella as they partied at the festival hours ahead of her 25th birthday.
But tensions boiled over during the trial after Broughton failed to take to the witness box with Mr Mtchie telling him “you’re evil, evil” outside the courtroom.
Broughton then flew into a rage and security staff had to restrain him as her heartbroken dad was ushered away by officers.
The court previously heard she was the first person in the world to die from taking the drug – a stimulant between ecstasy and LSD.
Speaking emotionally outside court this afternoon, Louella’s dad Mr Michie said: “Regardless of the outcome of this harrowing trial, there were never going to be any winners.
“We began our life sentence on what would have been Louella’s 25th birthday.
“Ceon’s life sentence is knowing he didn’t help Louella to live.”
Broughton, from Enfield, North London, showed no emotion as the verdict was announced – but yelled “text my mum” as he was led to cells.
The court had previously been shown distressing footage of Louella in the last moments before her death, with the yoga and dance teacher becoming disturbed, agitated and seriously ill, groaning, scratching her flesh and attempting to eat thorns on September 10, 2017.
But instead of helping her, Broughton filmed her “bad trip” – just 430 yards from the festival’s on-site welfare tent.
It took the jury just nine hours to find Broughton guilty of manslaughter and of supplying a Class A drug.
One harrowing clip lasted some 50 minutes and had her screaming for her mum.
Broughton had called Louella’s family as she began to hallucinate but despite their pleas, didn’t call emergency services – scared he would be caught for breaching a suspended jail sentence.
He also sent a message to a friend saying: “If the fam ask say a ra don have us 2cp (sic),” stating he didn’t want to get ‘bagged’ – believed to be arrested. The 30-year-old also described Louella as a “drama queen”.
The court heard Louella – described as a “free spirit” could have survived if she had received medical attention earlier.
Professor Charles Deakin, a consultant in cardiac anaesthesia and intensive care, said the footage showed she was “not aware of her surroundings” and became “seriously unwell and in need of urgent medical care”.
Scots actor John, 62, broke down in the witness box at Winchester Crown Court as he relived the night his daughter died during the trial.
Addressing Broughton, he hit out: “How could say you love someone who you left to die in front of you?”