This riddle has been around for some time on internet platforms such as Instagram, Facebook, and WhatsApp, and many people still argue over what the answer might be, as there are many possibilities. The correct answer is Jason is the killer. The numbers represent the starting letter of the month they stand for in a calendar: 6 – June (J) 4 – April (A) 9 – September (S) 10 – October (O) 11 – November (N)