Yes the deceased had a previous heart condition, yes he was under the influence of drugs.
Would he have died that day, just walking on the pavement, going by his day if the police didnt restrain and suffocate him ? That is the question to answer.
Obviously no, but Floyd was detained with reasonable suspicion of committing a crime so this argument does not hold up. If police arrest a guy while he's high on methamphetamine and has a heart attack during his arrest, do the police get charged for murder? If the individual was arrested for no reason, then potentially they'll get charged for something. But the police cannot be held liable for someone dying when they resisted if they used legal submission tactics, and the Minneapolis Police Department allows neck holds to gain control of suspects. The reason for Floyd's arrest was legitimate, and by released CCTV footage, it shows that the submission tactics was also legitimate because Floyd was resisting.
The autopsy report showed underlying conditions to contribute to Floyd's death, and he was on drugs during his arrest. This isn't a slam dunk case for the prosecution.
The cop is charged with 2nd-degree murder but also to 3rd-degree manslaughter (easier to prove).
They upgraded the charges to 2nd degree murder. I'm not sure of the double jeopardy laws but from my understanding, I don't think they'd be able to charge him for 3rd degree murder if they fail to get a conviction for 2nd degree, maybe wrong though. Another distinction, you can have a homicide but still not have a murder. A homicide is simply when one human being is killed by another. If police kill an active shooter who murdered 13 people prior to raising a gun to police, the shooter's death would be classified a homicide. Homicide does not indicate intent/fault for murder.