IPA: //ˈmɜːrdəriː//
KK: /mɜrˈdəri/
A person who has been killed unlawfully, especially in a violent way.
The police are investigating the case of the murderee found in the abandoned building.
The word 'murderee' originates from the combination of 'murder' (from Old French *murder*, meaning unlawful killing) and the suffix '-ee' (meaning a person who is the recipient of an action). Thus, 'murderee' refers to a person who is the victim of murder.
Think of 'murder' as the act of unlawful killing, and '-ee' indicates the person affected by that act. So, a 'murderee' is someone who has been murdered.
No commonly confused words.