He was a traitor. And he murdered someone in cold blood.

他是一个叛徒，而且他冷血地杀了人。

youdao

The crime had been committed in cold blood.

这起案件是蓄意犯罪。

《柯林斯英汉双解大词典》

According to the historians he murdered his rival in cold blood.

根据历史学家考证，他蓄意杀死了他的竞争对手。

youdao

Now that he had stopped, cold was forcing his blood to withdraw deeper into his body.

VOA: special.2010.05.01

Whenever it fell on me, my blood ran cold;

VOA: special.2009.05.16

There had been a series of events leading up to the first march including the murder of Jimmie Lee Jackson, a protester for voting rights who had been shot down in cold blood by an Alabama State Trooper.

FORBES: What Was Obama Talking About When He Cited The Historical References Of 'Seneca Falls And Selma And Stonewall'?

At the opposite end of the country, along Iran's border with Afghanistan and Pakistan, the security forces are also being stretched by dozens of bandit groups and particularly by the savagery of Abdolmalek Rigi, a young Baluch who kills in cold blood in the name of his vaunted ideals, Sunni Islam and Baluchi nationalism.

ECONOMIST: Iran (2)