This episode is about Pedro Rodrigues Filho aka The Brazilian Dexter.

Sources:

https://vocal.media/criminal/the-brazilian-dexter-the-haunting-tale-of-pedro-rodrigues-filho

https://medium.com/@dr.micahnaziri/the-life-story-of-brazilian-vigilante-pedro-rodrigues-filho-29-october-1954-5-march-2023-is-c5a7e2607cf7

https://www.lemonde.fr/en/international/article/2023/03/06/brazil-s-biggest-serial-killer-dies-in-shootout_6018404_4.html

https://jetsettimes.com/eternal-layovers/pedrinho-matador-the-killer-with-a-conscious/