Could it be possible my dad could die?

I have a history with heart problems when my mom suffered with it...your dad is on right track...stay on him to lose weight...being over weight can build fat around the arteries...which can lead to a heart attack...make sure he takes his medicine correctly...get his heart checked by a cardiologist on a regular basis...if possible...have him go through a stress test, ekg, echo, and maybe a heart cauterization...all this may help to see if any internal damage is done to the heart.. will answer questions you may have...on last thing...make sure he is eating healthy foods...hope this helps...I hope he gets better soon