It is determined that Cathy died of natural causes, but implied by the author that she died of a broken heart.
ɪɾ ɪz dɪtˈɜːmɪnd ðæt kˈæθi dˈaɪd ʌv nˈætʃɚɹəl kˈɔːzᵻz, bˌʌt ɪmplˈaɪd baɪ ðɪ ˈɔːθɚ ðæt ʃiː dˈaɪd əvə bɹˈoʊkən hˈɑːɹt.