What happens when you die from a cocaine overdose?

Cocaine Overdose: It's usually from a fatal cardiac arrhythmia or a myocardial infarction.

Your heart stops : Not sure what you mean here, but a Cocaine overdose, may cause the strain on the heart to be too much and cause an eventual stopping of the heart, resulting in death, at which point your brain stops to function as well. Cocaine use-bad! too much Cocaine use-very bad. Don't do drugs. Get help if you are addicted, see your dr. Or call a crisis center. Best wishes.