Here are the possible solutions for his stepbrother britannicus probably murdered him clue
Answer
Clue
Relevancy
nero
Clue
His stepbrother Britannicus probably murdered 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"
ferb
Clue
Cartoon stepbrother of Phineas
abel
Clue
Cain murdered him
attila
Clue
He murdered his brother Bleda
gesualdo
Clue
Renaissance madrigal master who murdered his wife and her lover