That’s 7.9mg/kg, not nearly enough ketamine to cause cardiac arrest in someone that size. LD50 in humans is at least 5-10x that.
Those officers that had him in a chokehold killed him, and are trying to scapegoat the EMS.
There is a name for this behavior: a lynching.
Erica Marrero, Kyle Dittrich, Jason Rosenblatt, and Jaron Jones, white cops, murdered an unarmed black man.
The entirety of the consequences they suffered? They lost their jobs. The police who declined to enforce the law against them are complicit.
Abolish the police.