但根据法医的调查结果，遇害者身上仅发现这把刀的DNA。
但辩方指出，这把刀太大，不符合遇害者喉咙上致命伤的形状。[{'character': '但', 'pinyin': 'dan4', 'highest pitch': 10.69, 'lowest pitch': 9.19, 'duration': 0.24, 'prosody hierarchy': '#1'}, {'character': '辩', 'pinyin': 'bian4', 'highest pitch': 10.69, 'lowest pitch': 8.78, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '方', 'pinyin': 'fang1', 'highest pitch': 10.4, 'lowest pitch': 8.78, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '指', 'pinyin': 'zhiii3', 'highest pitch': 9.73, 'lowest pitch': 5.17, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '出', 'pinyin': 'chu1', 'highest pitch': 9.35, 'lowest pitch': 8.15, 'duration': 0.33, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.16}, {'character': '这', 'pinyin': 'zhe4', 'highest pitch': 9.31, 'lowest pitch': 7.01, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '把', 'pinyin': 'ba3', 'highest pitch': 7.01, 'lowest pitch': 4.51, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '刀', 'pinyin': 'dao1', 'highest pitch': 8.57, 'lowest pitch': 7.57, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '太', 'pinyin': 'tai4', 'highest pitch': 9.47, 'lowest pitch': 8.26, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '大', 'pinyin': 'da4', 'highest pitch': 10.21, 'lowest pitch': 8.91, 'duration': 0.25, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.3}, {'character': '不', 'pinyin': 'bu4', 'highest pitch': 11.27, 'lowest pitch': 9.43, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '符', 'pinyin': 'fu2', 'highest pitch': 9.43, 'lowest pitch': 7.17, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '合', 'pinyin': 'he2', 'highest pitch': 7.71, 'lowest pitch': 7.27, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '遇', 'pinyin': 'v4', 'highest pitch': 8.24, 'lowest pitch': 7.5, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '害', 'pinyin': 'hai4', 'highest pitch': 7.51, 'lowest pitch': 5.9, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '者', 'pinyin': 'zhe3', 'highest pitch': 5.9, 'lowest pitch': 4.18, 'duration': 0.16, 'prosody hierarchy': '#1'}, {'character': '喉', 'pinyin': 'hou2', 'highest pitch': 6.23, 'lowest pitch': 5.7, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '咙', 'pinyin': 'long5', 'highest pitch': 8.4, 'lowest pitch': 6.23, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '上', 'pinyin': 'shang4', 'highest pitch': 7.72, 'lowest pitch': 6.61, 'duration': 0.23, 'prosody hierarchy': '#2'}, {'character': '致', 'pinyin': 'zhiii4', 'highest pitch': 9.74, 'lowest pitch': 9.13, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '命', 'pinyin': 'ming4', 'highest pitch': 9.13, 'lowest pitch': 7.98, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '伤', 'pinyin': 'shang1', 'highest pitch': 9.21, 'lowest pitch': 7.98, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '的', 'pinyin': 'de5', 'highest pitch': 9.21, 'lowest pitch': 8.18, 'duration': 0.11, 'prosody hierarchy': '#1'}, {'character': '形', 'pinyin': 'xing2', 'highest pitch': 6.08, 'lowest pitch': 4.78, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '状', 'pinyin': 'zhuang4', 'highest pitch': 9.04, 'lowest pitch': 6.08, 'duration': 0.24, 'prosody hierarchy': '#4'}]