Key ignition will not turn off

What is your question?

I have a 02 monte carlo my key ignition will not turn off I have to disconnect the battery every time I try to turn the car off or my battery will die. The key will come out of the ignition at any position it is in while it's running or off. It is not hard to start or get the key in or out. I tried changing ignition out but could not get the new key to come out of the new ignition so I put my old one back in. What could be the problem or what do I need to look for replace fix or find to resolve my issue?

What makes this problem better or worse?

Nothing

How long has your 2002 Chevrolet Monte Carlo had this problem?

3 weeks