No crank, no start, no power?

It had a bad battery about 8 months ago. Replaced it. A week later the radio started shutting off out of nowhere. It kept getting worse and eventually got to where I couldn't turn it on. I ended up taking the radio out of it. Then the cigarette lighter quit working. About 4 months later brings us to a week ago, and this is going on: The car started and then shut off. I rolled the windows down and then lost all power inside the car. The headlights will turn on, and I can turn the interior light on if I push the button. No dash lights at all, no sound or click when I try to start it, and they key won't turn all the way off and come out. I have to use a screwdriver and push the button under the steering column to release the key. I've tried jumping it, a new battery, replaced negative cable to battery, checked fuses, replaced ignition switch, and replaced the starter relay, still nothing. Can lock and unlock the car with the key fob, but can't roll up the windows.