Put key into car in reverse now car is not working?

I drive the car listed above srt8, car was working fine driving to work, until I got into the parking lot and parked. I put my key in reverse in the ignition switch and all the lights are on as usual, I turned the key to start (in some other cars I drive you can’t even insert the key backwards) and then all the electrical stopped and the car is dead? The key fob doesn’t work, no lights to indicate that the car is open or anything.