fˈoːɹ mˈʌnθs lˈeɪɾɚ, ɪn dʒuːlˈaɪ nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi θɹˈiː, sˈɑːnənbˌɜːɡ wʌz ɹᵻpˈoːɹɾᵻd tə hæv sˈʌfɚd ɐ hˈɑːɹt ɐtˈæk ɪn lˌɑːs ˈændʒəlɪs.
Four months later, in July 1933, Sonnenberg was reported to have suffered a heart attack in Los Angeles.