ɪnðə nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi, dʒˈɑːnəθən mˈɑːɹks, hˌuː wʌz ɹˌɛpɹᵻzˈɛntɪŋ mˈɑːɹk dˈeɪvɪd tʃˈæpmən fɔːɹ hɪz ɐlˈɛdʒd ˈækt ʌv mˈɜːdɚɹɪŋ dʒˈɑːn lˈɛnən, bɹˈɔːt dˈɑːktɚ. dˈaɪəmənd ɪn tə pɚfˈɔːɹm mˈɛdɪkəl lˈiːɡəl ɪvˌæljuːˈeɪʃənz ˌɔn tʃˈæpmən, bˌʌt bɪkˈʌz tʃˈæpmən lˈeɪɾɚ dᵻsˈaɪdᵻd tə plˈiːd ɡˈɪlti dˈaɪəmənd dɪdnˌɑːt ɡˈɪv tˈɛstᵻməni.
In the 1980's, Jonathon Marks, who was representing Mark David Chapman for his alleged act of murdering John Lennon, brought Dr. Diamond in to perform medical legal evaluations on Chapman, but because Chapman later decided to plead guilty Diamond did not give testimony.