As a medical professional with expertise in cardiology, I can tell you that the outcome of a heart attack can vary greatly from person to person. While it is possible for a heart attack to be fatal, it is not always the case that a person will die instantly from one. The severity and location of the heart attack, the individual's overall health, and the speed of medical intervention can all influence the outcome. Heart attacks occur when the blood flow to the heart muscle is blocked, usually by a blood clot. This blockage can damage or destroy part of the heart muscle, and if the heart is severely damaged, it may not be able to pump effectively, which can lead to death. However, not all heart attacks cause an irregular heartbeat, known as arrhythmia. Some heart attacks can be silent, with minimal or no symptoms, and the heart's ability to pump blood can be compromised without the person even realizing they are experiencing a heart attack. In summary, while a heart attack can be a life-threatening event and can lead to death, it does not always kill instantly. Immediate medical attention is crucial for the best possible outcome. read more >>

But heart attacks don't always kill instantly. ... And a person can also die from a heart attack that causes no irregular heartbeat at all �� the heart muscle can be so damaged from the lack of oxygen that the heart can no longer pump enough blood, which can lead to death, she said.read more >>