Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: The two men who killed Fusilier Lee Rigby in Woolwich have been sentenced for the murder. Their journey towards violence is still being unravelled.

Woolwich: How did Michael Adebolajo become a killer?