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"What is clear from the evidence presented by other witnesses is that drugs featured in both his and Jo's life and their lives did involve the use of cocaine and cannabis," added Det Ch Insp Brangwin.

Lifeblood's Chief Medical Officer, Jo Pink, in a statement said the changes are a significant milestone.

"Jo always cared for everyone around her, which was evident even in her last moments of her life," they said.

"The surviving victims and the families of Teohna and Jo have suffered enormously," he said.

"Watching people you love being stabbed is heart-breaking... I heard Jo screaming for her life, begging him to stop," Jake said.