Default [Q] Disable OTA and remove notification?

I'm trying to figure out how to stop updates and remove the notification on my Nexus 5. I've attempted a few ways I've seen people suggest to no avail (including what seems to be the most popular here on xda... dropping FOTAKill.apk into the /system/app folder). Anyone have a way to do this without touching any of the other background services?

Edit: I *think* it's gone, and I believe the FOTAKill.apk did work eventually. I had to download the update, delete the update out of cache, and then tell the updater to initialize. It did its countdown as if it would update, got to zero, and did nothing - but "Cancel Install" was still there. After that, the notification hasn't popped up again (I did a reboot as well)