1 Samuel 4:10-11, 18

And the Philistines fought, and Israel was smitten, and they fled every man to his tent: and there was a very great slaughter; for there fell of Israel thirty thousand footmen. And the ark of God was taken; and the two sons of Eli, Hophni and Phinehas, were slain.

And it came to pass, when he made mention of the ark of God, that Eli fell from off his seat backward by the side of the gate; and his neck brake, and he died: for he was an old man, and heavy. And he had judged Israel forty years.