Here are the possible solutions for his brother killed him clue
Answer
Clue
Relevancy
seth
Clue
His brother was killed by his other brother
abel
Clue
His brother killed him
neko
Clue
Rocker Case who tweeted "If a dude called me a 'cougar' I'd be more likely to kill him bare-handed and shit him out in front of his parents than fuck him"
onan
Clue
God killed him but not specifically because he spilled his "seed," though that was also bad
remus
Clue
Twin killed by his brother
niobe
Clue
Apollo killed her sons and Artemis killed her daughters
oedipus
Clue
Mythical Greek who killed his father and married his mother
orestes
Clue
Euripides hero who killed his mother to avenge his father