“Also, one of the officers stated he heard Floyd snoring.”
https://www.medicalnewstoday.com/articles/321487
“As someone approaches death, their body begins to exhibit symptoms. The breathing patterns change and can create a rattling sound. This sound is known as the death rattle, and it is a part of the dying process.
The rattle can occur when a dying person is no longer be able to swallow, cough, or otherwise clear saliva and mucus from the back of the throat, and because secretions in the respiratory tract may be increased.
The sound varies. It may be a crackling, wet noise that is amplified as the person breathes. In other cases, it may sound like a soft moaning with each breath, or a very loud gurgling or snoring.”
Sorry, that is not serious.
The restraint hold that Chauvin put on Floyd was explicitly defined and explicitly approved in the Minneapolis Police Manual.
Before the Floyd death, the same restraint was explicitly approved by hundreds (perhaps thousands) of USA Police Departments.
Before Floyd, how many people were killed by that restraint?
Probably zero - but there were lawsuits won by alleged victims of similar restraints.
By the way - fentanyl induces sleep, and it usually kills by suppressing breathing.