Fatty liver kills without any symptoms and it is caused by what they eat.
Feeding scraps daily can be a big problem.
I'd stop and start only feeding them a balance diet of ONLY the all flock or layer type pellets.
@Caleb1534 I look through som eof your older posts.
Looks like you have had some type of respiratory disease in your flock before.
I wonder if you possibly have Marek's disease. Send your next death to these people and you will get an answer as to what is is killing your birds unless it is the...