bˌʌt wɛn ˈɪndʒɚɹi sˈaɪdlaɪnd bɹˈʊklɪnz hˈɔːl ʌv fˈeɪm kˈætʃɚ, ɹˈɔɪ kˌæmpɐnˈɛlə, wˈɔːkɚ wʌz bᵻhˌaɪnd ðə plˈeɪt ɪnðə dᵻsˈaɪdɪŋ ɡˈeɪm ʌvðə nˈaɪntiːnhˈʌndɹɪd fˈɪfti wˈʌn nˈæʃənəl lˈiːɡ tˈaɪbɹˈeɪkɚ sˈɪɹiz ˌɔn ɑːktˈoʊbɚ θɹˈiː, , wˌɛn bˈɑːbi tˈɑːmsən hˈɪt ðə "ʃˈɑːt hˈɜːd ɹˈaʊnd ðə wˈɜːld," kˈɔstɪŋ ðə dˈɑːdʒɚz ðə pˈɛnənt.
But when injury sidelined Brooklyn's Hall of Fame catcher, Roy Campanella, Walker was behind the plate in the deciding game of the 1951 National League tie-breaker series on October 3, , when Bobby Thomson hit the "Shot Heard 'Round the World," costing the Dodgers the pennant.