Answer:
Homicide is when somebody kills or murders someone else
it is killing of another person by another person
Homicide comes from the words homo-, meaning "of the same," in this case, species, and -cide, meaning killing, such as pesticide, genocide (killing of members of a race), etc.
Homicide is the killing of another human being. It is the general term of such a type of killing, and is branched into criminal homicide vs. justifiable homicide. All murders are homicides, but not all homicides are murder.