Usage patterns
〈人〉が殺しを依頼するto order/commission a killing (contract murder)
The mob boss ordered a hit.
殺しの現場the scene of a killing
There were traces of blood left at the murder scene.
殺しの手口the method/modus operandi of a killing
The police closely examined the method used in the killing.
殺しをするto commit a killing
It's said that he committed a killing for money.
Expressions
殺しても死なないcouldn't kill (someone) if you tried; tough as nails