The first human killer in the world, according to The Bible, is Cain, who killed his brother Abel out of jealousy. This story is found in the Book of Genesis and serves as a moral tale about the consequences of sin and the nature of human conflict. In a broader historical or mythological context, various cultures have their own stories of first killers, but Cain remains the most widely recognized figure in this regard.
Liu Pengli of China (144 BC) could be the firt serial killer in history.
by discovering the world's first antibiotic, or bacteria killer
monkeys, although they were not human.
Jeff the killer is not human he isn't real people think they have seen him but, there is no complete proof.
"killer dolphin" is not a recognized name for a species.
burn the coal in night, is a painless killer (human killer)
Natural killer (NK) cells originate in the bone marrow of the human body.
if ingested it can
human tigers
This question requires a subjective answer. The deadliest killer in human history was the Black Plague which wiped out millions of people in Europe.
A killer whales predator is a human cause they hunt them for blubber
The first human prophet was Enoch.