He hit his head in the wrong spot and that may have been the cause of his death.
ーHe died because he hit his head the wrong way.
「彼は頭の打ちどころが悪くて亡くなった」
to hit one's head the wrong way「頭のよくないところを打つ」を使って「打ちどころが悪い」を表現できます。
ーHe hit his head in the wrong spot and that may have been the cause of his death.
「彼は頭の打ちどころが悪くてそれが死因となったようだ」
to hit one's head in the wrong spot「頭のよくない場所を打つ」を使っても「打ちどころが悪い」を表現できます。
ご参考まで！
カナダ 
