Police believe that somebody is shielding the killer.

警方认为有人把杀人凶手窝藏了起来。

《牛津词典》

The police are trying to discover the identity of the killer.

警方正努力调查杀人凶手的身份。

《牛津词典》

The players lacked the killer instinct.

这些运动员缺乏门前的嗅觉。

《牛津词典》

Will you not vote for the killer if you already feel the cold steel of his gun against your head?"

VOA: special.2009.10.02

So will we be using the internet for video on-demand, will that be the killer app? Will millions of people wide watch this video right when they want to watch it?

所以我们会使用互联网实现随需视频么，那会成为杀手级应用么？会有数百万人,就在他们想看的时候看到视频么？

麻省理工公开课 - 媒体、教育、市场课程节选

Gary Gilmore The serial killer Gary Gilmore basically said the pain of others gratified him and caused him no unhappiness at all.

连环杀手,基本上就说过别人的痛苦,让他很高兴，他一点都不讨厌。

耶鲁公开课 - 心理学导论课程节选

Hull pressed hard for a late equaliser but continued to lack the killer instinct in the final third.

BBC: Hull 0-2 Cardiff

But they have to avoid being "despatched" by the killer before they find out their identity.

BBC: Tamzin Outhwaite in Final Demand

This seems to fit the story of the estranged wife of the killer, Zina Haughton.

FORBES: The Brookfield Shooting is Part of a Rising Tide of Domestic Violence