Chicken Killed Last Night

We heard some commotion late last night and I went out this morning and there was a chicken dead and partially eaten in the coop. I checked and the electric fence was still on and surrounding their area so I assume it wasn’t a ground based predator. I haven’t been closing up the coop at night, mainly because I don’t want to go out every morning and night and open and close a door. However I guess I’ll have to re-think this.  I would love an automatic door, but those a re a bit pricey. I’ll have to look around the internet for a more affordable option. There was a lot of brush in this area before the chickens were moved there and I think that protected them as there wasn’t a good landing place inside the fence.  However chickens doing what chickens do the area is opened up now.