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: Peter Madsen was once a kind of celebrity in Denmark and many seemed fascinated by the self-taught engineer who talked with enthusiasm about ocean exploration and space travel.

Peter Madsen: Who is Kim Wall's killer?