He disappears from the story after having a nervous breakdown following the failed 'unification' of the steel industry.
hiː dˌɪsɐpˈɪɹz fɹʌmðə stˈoːɹi ˈæftɚ hˌævɪŋ ɐ nˈɜːvəs bɹˈeɪkdaʊn fˈɑːloʊɪŋ ðə fˈeɪld jˌuːnɪfɪkˈeɪʃən ʌvðə stˈiːl ˈɪndʌstɹi.