Why won't the car start?

While passing a car on the interstate, my car went into passing gear, then the engine rpms increased even more then usual. I let of the gas, engine oil light came on and then the engine quit running. Coasted to a stop, tried to start engine and the starter just spun, it did not engauged the engine. The dealership told me that the engine was frozen, oil and antifreeze was gone, and starter was bad. But the car had had all its fluids and there were no leaks.