You don't die of a seizure. It can cause a sequence of events but it is almost never the cause of death.
The seizure can cause a fall and a broken neck, a fall to a ravine where you can't climb out and then you freeze to death but it wasn't the seizure that killed.
If you have a gran mal? seizure it will knock you out and when you come to you will not where you are and you will be too weak to move. The paramedics have to pick you up and transport you to the hospitol for a night or two.