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 police knew they had to trap the killer.

警察知道他们得抓住那个凶手。

《柯林斯英汉双解大词典》

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

To me this is as inane as someone saying that the killer watched The Walking Dead.

FORBES: CNN Picks Their Game to Blame: Starcraft?

Hardy feels like a broken man and sees his path to emotional recovery in stopping the killer and the network of killers Carroll is recruiting.

FORBES: Connect

Fiona Brookman, who wrote a recent Home Office study, believes that the killer or the victim (or both) are drunk in about half of all male-on-male murders.

ECONOMIST: Murder