Serial killer question.

I've decided to get back into my writing again to take my mind off of my up & down pregnancy right now. It's always been my dream to get Into horror & suspense novels so I've finally got a plot that I plan to write and publish by November...Anyway my question to you all is...

what questions would you ask a serial killer?

if you were a reporter or writer doing an exclusive one on one interview with a notorious serial killer that was willing to answer any and everything for a book or story you were writing about his life & crimes what question or questions would you ask?

Thank you ☺