What do you when have killed Darth maul on Lego Star Wars?

You may be referring to the video game Lego Star Wars: The Complete Saga**. In this game, Darth Maul is a playable character after he has been defeated in the story mode. Here are the steps to unlock him:

1. Complete the story mode.

2. Go to the Character Creator.

3. Select the "Villain" tab.

4. Scroll down to the bottom of the list and select Darth Maul.

5. Press the "Select" button to unlock him.

Once you have unlocked Darth Maul, you can use him in any level in the game.