What is more likely to kill you; A lethal dose of amphetimines or a scarf pulled around your neck?

Man in Australia being charged with manslaughter for "pulling" a scarf on woman's neck.
https://au.news.yahoo.com/nsw/a/23331769...
Update: Yes, the article doesn't mention detailed evidence. Perhaps the drug was administered after her death? Then the heart wouldn't be beating to push the drug around and end up in her liver.
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