Step 1: Head to the Facebook Developers page where you originally created an app to enable Timeline. Click "Edit app."
Step 2: The only way to remove Timeline is to delete the app. If you are an actual developer, you're out of luck. Otherwise, click "Delete app" in the left sidebar.
(Credit: Screenshot by Sharon Vaknin/CNET)
(Credit: Screenshot by Sharon Vaknin/CNET)
Once you confirm the app deletion, your Facebook Timeline will be disabled.