Pedro Rodrigues Filho (29 October 1954 – 5 March 2023), also known as Pedrinho Matador, Killer Lil' Pedro, Killer Killer Petey, or simply Killer Petey, was a Brazilian serial killer, spree killer, vigilante, and YouTuber known for pursuing and killing exclusively suspected criminals as a teenager, between the age of 14 and 19, in particular an entire gang in response to the murder of his pregnant girlfriend. Officially sentenced for 71 murders but claiming to have killed over 100 drug dealers, rapists, and murderers, he served 34 years in prison before his release in 2007.
https://en.wikipedia.org/wiki/Pedro_Rodrigues_Filho