Why did Eli the priest fall backwards in distress and break his neck?

ANSWER

He heard the Ark of the Covenant had been captured

1st Samuel 4 :

17 The man who brought the news replied, “Israel fled before the Philistines, and the army has suffered heavy losses. Also your two sons, Hophni and Phinehas, are dead, and the ark of God has been captured.” 18 When he mentioned the ark of God, Eli fell backward off his chair by the side of the gate. His neck was broken and he died, for he was an old man, and he was heavy. He had led Israel forty years.
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