Why did car die and now it won't turn over or even start?

I am no auto mech. but avi. tech prior US military. I have a 2004 Ford Explorer XLT V8 4.6L that had same issue. Of course, check each thing first, but my battery, alternator & newly replaced starter all same issue as you. No start, died in McDonald's drive thru. Check ignition & starter /relay fuses easiest first. I had a bad / seized up compressor (a/c). This burned out compressor can cause engine serpentine belt to stop turning flywheel. This also controls other things. So replaced with new compressor & labor ($1,140) and it started right up fine. A/c compressor kicks "on" when you select setting on dash panel blowing cold as normal or max cold. Just be sure the mech. Is reputable, because now 4 months later my compressor is seized up again. It is only because the idiot mobile Mechanic didn't oil the new installed compressor as it must be done prior to the 1st time use. After that it is ok. And a Compressor for vehicles should last 12-15 years! I know he refilled the R153a refrigerant for the system, but failed to remember to oil compressor motor / clutch (initial use of new equipment). Hope this helps you & thinking of your problem vehicle issue with a Ford Exploder, lol. (May not be the same as your engine dying, not starting.) GOD'S Speed. Semper Fidelis.