Conversation so far:
What does Stewie B.
Goode have to do with this topic?
When Stewie is revived by Lois, he believes it is a sign for him to be a good boy.
How did Lois revive him?
CANNOTANSWER.
What was Stewie doing when he had to be revived?
As a last resort he tries to kill him by rigging a lifeguard chair with dynamite and luring Brad beneath it with marzipan; however, Stewie's detonator malfunctions.

Question: Why was Stewie trying to kill Brad?
Self-contained rewrite: Why was Stewie trying to kill Brad?