Can a person die of a heart attack from taking too high a dose of clonidine?

Yes it can lead to death whereby there would be unsafe drop in blood pressure

My prescribed dose of clonidine is 0.3 milligrams 3 times a day. However I had a heart attack a year-and-a-half ago from taking far too much Clonidine. Now, I'm not saying your son is taking too much and that's certainly not for me to say but clonidine is not something to be messed with and I would be remiss if I didn't recommend talking to the doctor if you have any questions. I now have a pacemaker because of that heart attack and permanent heart issues.

I had a triple bypass 2008 and I had been on .2 milligrams of clonidine a day sometimes 3. I no longer have insurance and it's hard for me to afford a doctor to get my refills now I am out and I don't feel too good. I get really angry and nervous. Is this normal. Thank you

clonidine have adverse effect of hypertension & hypotension
with a high dose it cause hypertension and after elimination it shows hypotension
so take a dose as prescribed by the physician

Clonidine causes fall in bp by acting at cns. Otherwise it is a sympathomimetic drug. Taking a high dose lets clonidine escape into general circulation to cause vasoconstriction.
Regarding withdrawl, it can lead to severe hypertension. If you have side effects like sedation and want to discontinue, dearease the dose slowly and replacing it with other medication like lebatolol.

The dosage is based on your medical condition and response to therapy. There have been reports of rare, but very serious (possibly fatal) results, including stroke, from stopping this drug too quickly.

Do not suddenly stop using this medication without consulting your doctor because your condition may become worse. A serious rapid increase in your blood pressure (rebound hypertension) may occur when this drug is suddenly stopped or if you miss replacing the patch for 3 or more days, especially if you have been using it for a long time, at higher doses, or with a beta-blocker medication. Therefore it is important that you do not run out of clonidine.

Even after 7 days, the used patch still has some medication in it. To prevent an accidental overdose, after you remove a used patch, fold it in half with the sticky sides together and discard in the trash away from children and pets.

Talk with your doctor if this medication stops working well (e.g., your routine blood pressure readings increase).