What could possibly cause my ML320 to just die while driving?

What is your question?

I was driving down the highway and my ML320 lost all power. All of the gauges fell like I had killed the engine. When I tried to start it again it would not even crank the starter. My windows won't roll down and the doors won't lock (except manually) and I don't have blinkers or interior lights. It was full of gas, I disconnected/reconnected the battery, and checked all the fuses. I have headlights and the radio, odometer reading, and temperature will show up but that is all. Any help or suggestions will be greatly appreciated. Thank you,