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が死んだという知らせ

the news that [someone] died

→ が
phrase Rare #42,278
the news that [someone] died The が marks the person who died; という知らせ means “news that...” or “the report that...”.
JA: 友人が死んだという知らせを聞いて、みんな悲しんだ。
EN: Everyone was sad when they heard the news that their friend had died.

彼の息子が死んだという知らせはとてもショックだった。

The news of his son's death was a great shock.

我々は彼が死んだという知らせを受けた。

We received the news that he had died.