Ketamine not helping is not the same as ketamine killing. If paramedics had instead applied bandaids, those bandaids would not have helped him, but that's no reason to claim he was killed by bandaids.

On one hand, you have cops trying to pull the man's head off, starving his brain of oxygen. On the other hand, you have a sedative that is renowned for being safe, administered in a quantity that should be safe a few times over. How in the world people look at this situation and blame ketamine instead of the cops is completely beyond me.

In this case though it actually looks like he was given an overdose when considering his body weight, and he suffered the cardiac arrest enroute to the hospital, not on site. Coroner suggests drug reaction, the hold or asthma attack might have all played a role in the death.

Also the recorded audio sounds like he was pleading with the officers and compliant, not that he needed further restraint or sedation.