It hurts. It's disappointing. It's puzzling. It's guilt producing. What could I have done wrong? Why did my otherwise healthy, perfect-in-every-way chicken die? I lost a healthy in every way pullet this morning. It's heart breaking because she was close to laying her first egg, and she was one of my favorites from my latest batch of EE chicks. I found her lying on the floor of the coop this morning. No, no sign of attack by a predator or the other chickens. Not a mark on her flawless body, no secretions out of any orifices indicating illness. She had not been acting sick. But I do know what killed my pullet because after a string of these unexplained deaths, beginning with the first two adopted hens that began my flock nine years ago, I had a necropsy performed. It was a couple years ago that I learned that lymphotic leucosis is present in my flock, a nasty, incurable virus that causes tumors on the organs of chickens that aren't resistant to the virus. My pullet probably had tumors on her heart and died of a heart attack. This post is purely to inform others that mysterious deaths have a cause and shouldn't be written off as a fluke. Have a necropsy done on that chicken that died suddenly "for no good reason". You need to know why. It could affect all your other chickens, and even other flocks in the area. I know that I'm running a risk each time I introduce new chicks into my flock. Some will have a genetic resistance to the virus, but others won't. My new EE pullet obviously didn't. The amazing thing is that I have a flock of 24 other chickens, ages two months to eight years, that are as healthy and productive as any normal flock. Most appear to be resistant to the disease. It still hurts like the devil when I lose one.