Wrong, but close!
When Mrs. Horn died (the first death in the Company), Flicker decided himself to focus on rogue levels.
Other deaths:
Ernie, killed by anvil-handed golems
Aravis, killed by Null Shadows
Grey Wolf, Kay, Makel and One Certain Step, all "killed" in the Crosser's Maze, but they were alive again when the rest escaped. Those so slain suffered irrevocable wisdom loss.
One Certain Step, Makel and Snokas were also all killed in more conventional ways. It's a tough world for NPC's!
Interestingly, the killed characters have been brought back to life in every single case, though Makel and One Certain Step went on to die again in more heroic fashions.