Chu Xiu didn't kill Ouyang Tiance to silence him; he merely imprisoned him.
The reason was simple.
As a direct descendant of a major family, he would surely have a life token.
If he died, the shattering of the life token would undoubtedly alert the Ouyang family.
LitRPG: My Unique Talent Is Fate Hints
LitRPG / Adventure
LitRPG: Every Attack Gives 1 Permanent HP
LitRPG / Sci-fi
LitRPG: My Real Body Is the Cheat
LitRPG / Sci-fi
Global Stat Points: I Maxed Out Attack Speed
LitRPG / Urban
LitRPG: I became the God of Mining
LitRPG / Xuanhuan
After the World Became a Game I Chose Black Talent
LitRPG / Mature
Myth Invasion: I Kill Gods on Earth
Urban / Comedy
God-level Assassin, I'm the Shadow
LitRPG / Urban
Global Panic: The Gnoll That Farmed the World
LitRPG / Urban