I Samuel 4:10-11, 18

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

Then it happened, when he made mention of the ark of God, that Eli fell off the seat backward by the side of the gate; and his neck was broken and he died, for the man was old and heavy. And he had judged Israel forty years.