What chapter does Colin Creevey die in Harry Potter 7?

Colin Creevey is not killed in Harry Potter and the Deathly Hallows. He is actually injured in the Battle of Hogwarts but survives.

He appears in Chapter 21, "The Battle of Hogwarts," where he is injured by a Death Eater.

You might be thinking of another character, or perhaps misremembering a detail.