• killed in cold blood – хладнокровно убит
• murdered in cold blood – хладнокровно убит
• shoot a person in cold blood – хладнокровно застрелить человека
См. также: in every possible detail, in quadruplicate, in or out of court, in the works
'A cop can shoot a person in cold blood and get away with it…' (The Saturday Paper)
But he added: “You killed the man you loved. You are not a cold-blooded murderer, a crime of passion is not committed in cold blood.” (The Guardian)
