I am SPECULATING here, no proof, just a guess.
When the police showed up Saint George had drugs on him. As an ex-con he would have gone to jail for a long time for possession and possibly dealing. You don’t drive a nice Mercedes on an ex bouncers pay.
My GUESS is that he swallowed the evidence and it killed him.
Nobody knows what killed him yet. In the mean time we can only speculate.
If we think the rioting is awful now, when the full coroner’s report comes back to reveal that the neck restraint did NOT cause Floyd’s death, the full out black revolt will be an act of war. There is no way that the American Black community will find such a revelation trustworthy - they will scream conspiracy, white bigotry, and death to the oppressive white devil slave-masters.