He’s gonna get severely ill in a month or 2 and die in a hospital. Death: natural causes.

just looked it up

Withdrawal symptoms occur because the ketamine has altered opioid receptors in the brain. Psychological withdrawal symptoms can be dangerous. Perhaps the most dangerous is intense depression, which can lead to an increased suicide risk.

Withdrawal symptoms from ketamine are primarily psychological in nature. Some chronic users have reported experiencing physical withdrawal symptoms, but these have not been scientifically proven. The most common ketamine withdrawal symptoms are:

Agitation
Confusion
Psychosis, including delusion and hallucination
Loss of motor skills
Rage
Nausea

Decrease in respiratory and cardiac functions
Insomnia
Shakes
Hearing loss
Fatigue
Cognitive impairment

They can suicide him and claim it was the katamine addiction