So I discovered a series like Investigation ID or sumthing

[Lady ♥ Belleza, Gif Princesa]

Based in Australia

What was Ivan Milat's nickname and how did he get it?

[Fishface]

He was called the Backpacker Murderer because he preyed on young people backpacking across Australia.

[Lady ♥ Belleza, Gif Princesa]

That's a big DING DING DING for Fishface!