For years, a calm, calculating predator stalked the suburbs of Melbourne, leaving behind almost no evidence — only terrified families and a growing legend known as "Mr. Cruel." Decades later, his crimes remain unsolved, and the questions surrounding Karmein Chan’s murder still haunt Australia. This week on Timesuck, we examine one of the most chilling unidentified offenders in Australian history. Is he still out there? Or did he die after being arrested for other, similar crimes?