Keep chickens inside after attack?

Today I most likely lost my rooster because of a predator. I found lots of his feathers and he didn’t return to the coop. Didn’t see a single drop of blood or anything else. He is a huge Orpington so I’m guessing a fox and not a hawk or owl. Hoping for his return but expecting the worst…

His five hens were unharmed and don’t seem stressed at all. They went in their coop at sunset as usual. Should I keep them inside for a while? They have been free ranging for over a year without any issues.

Whatever got him probably noticed that there were other chickens around, and if it was big and strong enough to take down your rooster then it certainly won't be intimidated by your hens. In my experience with this, if I lose one free ranging, I am going to lose more the next day. So into the coop they go for a while. I would suggest at least a week, but my area is different from yours. I have a lot of predators around and if I free ranged them for a year straight I would lose at least 10.

Sorry for your loss Daniel.  Did you see any animal prints around the area your chickens like to hang out?  I have always wanted a crittercam, that would be useful in a situation like this.
Keeping the hens in is the safest way to go. They won't be happy, but safe. The problem is there's no way to know if this is an isolated incident, or if it range the dinner bell. No easy answer.
You never know your rooster could come back, I had a hen disappeared for several days, and showed up unharmed one day.  Good luck to you.

Sorry for your loss, Daniel. Hoping he miraculously returns unscathed!

Was this during the day time that he disappeared? Are there domestic dogs about? They can be quite problematic predators, especially since once they learn about the existence of chickens, they'll be back.

I think you're wise to keep the girls inside till you figure out who the predator in question is and some time passes.

It has been two weeks and still no sign of him... The hens don't seem to care or miss him, although he was always so good to them. He probably gave his live for them. It happened during the day (it was raining and I was inside while I'm usually always outside). The neighbours have a dog but they are not too close and I have never seen the dog in the almost 3 years I live here. It's also quite impossible to go from their property to ours.

I kept the hens inside for almost a week and only let them out for 2 hours at the end of the day while I watched them. They didn't like it the first day, but got used to it soon after.

They are now back free ranging for a week without problems, hopefully it stays this way. It's pretty stressful, getting startled by every cluck. They can be noisy, for example when they want to lay their eggs in the same nesting box at the same time (while there's 3 available for them ◔_◔)