One word

Killing oneself	suicide
Killing one's wife	uxoricide
Killing one's son or daughter	filicide, prolicide
Killing one's sister	sororicide
Killing one's parent(s)	parenticide
Killing one's mother	matricide
Killing one's husband	mariticide, viricide
Killing one's father	patricide
Killing one's brother	fratricide
Killing close relative	parricide
Killing an infant	infanticide
Killing a friend	amicicide
Killing a foetus	foeticide
Destruction of a culture	ethnocide