89 Honda Accord Car will not shut off

I have an 89 Accord 4cyl 5spd.
Ok, drove to work last night (in the dark) headlight on..Got to work no problem. I shut the car off..No problem..About two hours later a workmate told me my reverse lights were on ( I left the car in reverse when I parked it). I went to the car and found my reverse light were on and so were all my dash lights...The key however was in the off position. I turned the key and the car started no problem but when I turned the key to the off position, the car continued to run. I could remove the key from the ignition and the car kept running. I ended up having to intentionally stall the car using the clutch to shut it down. I then had to disconnect the Positive terminal at the battery to kill power.
I ASSUME I need a new ignition switch but wanted to run this past some experts before I spent the $$..If you agree that it is the Ignition switch, do I need to pull the wheel or is the switch accesabile otherwise? Thoughts??
Thanks!!

Steve