重要证人 meaning in English

material witness

You shall be the significant rapper of law case this time homiciding
你将是此次杀人案件的重要证人
The mafia hired a hit man to go after the key - witness in the trial
黑手党雇佣了一名职业杀手去追杀一名法庭上的重要证人。
Some cases are delayed or even put off until another date . this may be because an earlier case has gone on longer than expected or an important witness in the case has not arrived
有些案件延迟开审，甚至取消聆讯，另订日期再审，原因可能是较早的案件需时比预期长，或案件中有重要证人未到。