Bryn Spejcher of Thousand Oaks, California, picked up a bread knife and stabbed her new boyfriend 108 times — killing him — before turning the blade on her dog.
The 32-year-old, who worked as an audiologist, then proceeded to stab herself — only stopping when police hit her nine times with a baton.
On Friday, Spejcher was convicted of killing her boyfriend — Chad O'Melia, then 26 — and awaits sentencing.
Forensic psychiatrist and expert witness Dr Kris Mohandie told the jury last month that Spejcher was a 'normal' girl with 'no history of mental illness or violence' who was committed to 'doing good' in the world.
That fateful night her brain was completely overtaken by extreme psychosis — induced by potent marijuana that had been supplied by her boyfriend, he said.
In testimony from Spejcher herself, the healthcare professional said she'd smoked weed only a few times before, and had 'never been high'.
Her attack was launched because she had 'lost touch with reality', as the cannabis had triggered 'voices in her head'.
Dr Mohandie warned people with 'no prior history of violence can consume cannabis, even during one session, and then proceed to commit acts of physical violence to themselves and to others'.
https://www.dailymail.co.uk/health/article-12823769/bryn-spejcher-cannabis-induced-psychosis-psychiatrist-california.html 