No, he could imagine Marta being a murderee, but not a murderer.

不，他可以想象玛尔塔是一个被谋杀的人，但不是凶手。

Or, as the Journal would prefer to phrase it less elegantly, is anything to be gained by finding out who committed a murder when the murderee is already dead?

或者，正如《华尔街日报》更愿意用不那么优雅的措辞来说， 在被谋杀者已经死亡的情况下找出凶手是否有任何好处？