Should the plaque rupture, the cholesterol crud within it will leak onto the endothelial surface. This junk is a powerful agent of coagulation and will almost instantly lead to thrombosis and complete occlusion
  • No blood flow to most of the left ventricle.
  • Fatal arrhythmia (most likely), or
  • Massive myocardial infarction
Myocardial infarction
Adapted from Robbins; Pathologic basis of Disease, 6th Ed.

Here's an example from somebody else.