Don't inject poison in your victim. Inject a syringe filled with air in their veins or between their toes, it will mimic a heart attack and the victim death will look more... different. It will just look like a heart attack even if you protagonist knows that it is a murder.
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101 Murder Tips
RandomThere are more murde - writers here than I anticipated. *Please note that the information given is by no means meant to be taken and used to harm others; I've provided it as an aid for writers and the curious and have not intended it to be put to us...