We have had so many...

Dahmer. Son of Sam. The Black Dhalia. The Alphabet killer. The Chicago Strangler. And so many more. Some were caught. A lot weren't even ever identified.

Kyoto Animation arson attack

Prime minister convicted of embezzling 1.1B in sovereign funds, used Saudi and religious influence to game a general election (he lost), linked to a c4-based murder of a foreign national, wife accused of financial misappropriation and yes, parts of the population still want him to return to power.

Not the Philippines.

country is pretty vague. I'll answer in my "somewhere where I pass once a month or so" answer.

There was a hair stylist place about ~20-30m from us where my mom actually went once. In-between my parents old school and where we live now. I forgot the full story but the TLDR is that an employee got fired then went insane and murdered her boss in the stylist place then cleaned it so well nobody thought it happened there, but when they turned on a black light there was blood everywhere. I think there was something about sawing a head off too?

I'm missing a TON of details because I was about 10 when it happened, but for me it was creepy AF considering how there's a chance my mom saw the person.

edit: iirc there was an episode of it on a true crime Netflix show

Paul Bernardo and Karla Homolka, "The Ken and Barbie Killers".

Going back a bit but another young lady, Lizzie Borden