I DONT KNOW WHAT TO DO!!! PLEASE HELP!!!

[JedJackson]

I also agree with ChickenCanoe. If another bird dies or you still have the last one, send it to the lab and get the testing done. It is the only way to know if your flock carries a serious disease or not, and which one if the flock is infected. And then go from there.

 

[Master Hatcher]

That may be a possibility but I don't think the OP mentioned a respiratory problem or any symptoms at all other than sudden death.
I certainly wouldn't proactively start dosing an antibiotic without definitive results of lab diagnosis and cultures. Guessing is how problems are prolonged and overuse of antibiotics happen. That leads to resistant bacteria and superbugs. Best approach is to determine what is actually causing sudden deaths.

Thats why i proposed the OP to check for it and said “IF” never said to just start dosing them . Come on people read lol