My car and lights wont turn off... help

ok this is on my 92 cadillac sts... maybe you guys can tell me what is going on. Yesterday as it began to darken outside I notice my parkking lights were on so i go inside and look but the switch is on the off position, I unlock and lock my car from my alarm remote but it would only turn them off for a few seconds and stay on. I then get in my car and start it but when i tryed to turn it off and took out the key it stayed on... it took almost 15min to turn off... so now my lights wont go off and when i turn on my car it stays on... for the time being i disconnected my battery... what can be wrong??