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: A "sadistic" teenager who killed a 14-year-old he met online was arrested over the suspected rape of another boy almost three years beforehand.

'Sadistic' online killer Lewis Daynes arrested over rape claims