The killing of a human being. Homicide has undoubtedly been practiced for as long as humans have existed, and the act has developed a plethora of variations. Listed below are terms relating specifically to the killing of humans.
mariticide - killing one's spouse
martyrdom - killing of the faithful who refuse to renounce their faith
massacre - killing of many, indiscriminately
matricide - killing one's mother
murder - killing unlawfully and with malicious intent
parricide - killing one's parent (also parenticide)
patricide - killing one's father
prolicide - killing one's offspring
regicide - killing of a monarch
senicide - killing of an old man
sororicide - killing one's sister
suicide - killing oneself
tyrannicide - killing of a tyrant
uxoricide - killing one's wife
vaticide - killing of a prophet