1 Samuel 4:10-11, 18

So the Philistines fought, and Israel was defeated, and they fled, every man to his home. And there was a very great slaughter, for thirty thousand foot soldiers of Israel fell. And the ark of God was captured, and the two sons of Eli, Hophni and Phinehas, died.

As soon as he mentioned the ark of God, Eli fell over backward from his seat by the side of the gate, and his neck was broken and he died, for the man was old and heavy. He had judged Israel forty years.