What predator would pile up dead chickens?

[Roosterfeather]

Sounds like a weasel to me.

 

[McChooky]

Neither one of them was during the time they have young so that wasn't it. I had seen that particular racoon around before. Yes, our coop is well protected. They were free ranging and I forgot to close the run door two nights in a row. I've got an automatic coop door now so no issues.

"I have had multiple mass slaughters of my flock due to racoons"

Raccoons care for their young a year after they're born.If you have one you have more.They like to bring the whole family for dinner