A parricide is a person who murders is father, mother, or other close relative. There are certain specific words to describe a person who murders a particular relative. A patricide is a person who murders his father. A matricide is a person who murders his mother. A fratricide is a person who murders his brother. A sororicide is a person who murders his sister. An uxoricide is a man who murders his wife. A filicide is a person who murders his or her child. A mariticide is a woman who kills her husband. The same words are what we call the person who commits the crime, and what we call the crime itself. Example: A person who murders his father commits patricide. Note: All of these words are rarely used. But they do exist, and you may hear or read them from time to time.