According to the BBC, Cabo “Corporal” Bruno was arrested for the first time in 1983, accused of extortion and for killing more than 20 people. In the relatively lawless outskirts of Brazil’s largest city, it’s believed Bruno took the law into his own hands, motivated by his own perverse sense of justice. Per People Pill, he purportedly killed “for hating the fringes,” referring to the underprivileged citizens of São Paulo. It’s also believed he killed just because he didn’t like the way some people looked. He was only caught when one of his victims pretended to be dead and escaped.

Following his initial arrest in the early 1980s, Bruno confessed to only one murder. Later, he admitted to 20 killings, a gruesome total that would reach as high as 50, including 12 police offers, although Bruno frequently changed his story, retracting his confessions at several points over the course of a dozen trials. It’s also believed that Bruno was a ringleader of a gang perpetrating other crimes. Could the São Paulo Police force have something to do with the killing of Bruno following his release from prison? Signs point toward an “extra-judicial” killing — or that it was unrelated to the São Paulo police, per BBC — but at the time of this writing, the investigation is ongoing, and no one has been charged for the crime.