Everyone is fixated on the possibility of Atreus being the one to end Kratos' life, but the truth is, it's not even entirely clear what the mural depicts. It shows Kratos dying in Atreus' arms, but that doesn't necessarily mean that Atreus was the one who dealt the final blow.

Is Atreus going to betray Kratos?

Kratos then sees the mural's final panel when the fabric covering it blows aside. It appears to reveal Atreus cradling a dying man who resembles Kratos in many ways. ... It's not surprising that fans would conclude that Atreus, now revealed as the Norse god of deceit, will betray and kill his father in the next game.

Who will kill Kratos in God of War 5?

Much like Norse mythology, God of War's fiction ties these two characters together. The witch from the game's trailers is Freya. She heals Atreus, brings Mimir back from the dead, and is also Baldur's mother. Unbeknownst to her, Baldur is out to kill Kratos.