Adolfo de Jesus Constanzo, was former apprentice to a Haitian priest who blossomed into a master-level Crazy Mage armed with the legitimate belief that he had the power to see the future and cast powerful spells, especially dark magic, provided he kept his black magic cauldron well-stocked with sacrificial human body parts. He had a cult of devoted followers to fulfill this task for him by kidnapping (mostly) random people and torturing them to death to appease Kadiempembe, a devil-like figure and the bestower of his magical gifts. We assume this same demon was responsible for granting him the handsomest Emilio Estevez mullet in recorded history.

Constanzo was a warlock for hire, selling his spells and clairvoyance abilities to druh dealers and law enforcement officials in Mexico. He stewed human brains, blood, bones, and guts in his cauldron alongside scorpions, spiders, and other witchcrafty totems to create spells to make his clients invisible to police detection and invulnerable to gunfire.

Even the drug dealers were afraid of Constanzo. when one cartel refused to make him a full partner after they'd enjoyed so much success with his spells, seven of their members mysteriously disappeared, turning up several days later floating in a river with fingers, ears, hearts, brains, and freaking spines removed, like they'd been attacked by the goddamned Predator. Constanzo had a handful of other rival drug traffickers fed to his cauldron and even had a member of his own cult hacked into dark wizard porridge to set an example for the rest of the team.

The heat didn't really come down on Constanzo until his group kidnapped and mutilated an American college student, at which point the U.S. government put intense pressure on Mexican officials to solve the crime. Police followed a member of Constanzo's cult to  his terrifying ritualistic murder ranch after the man blew through a checkpoint, and they found remains of 15 people buried along the property. The missing student's brain was discovered floating in a potion in Constanzo's cauldron, presumably waiting to be graded by Professor Snape.

Constanzo's gang was hunted down and arrested, and Constanzo himself was finally cornered in an apartment surrounded by 180 police officers, because magic probably isn't real, but we aren't taking any chances. Rather than allow himself to be captured, Constanzo instructed one of his henchmen to shoot him. The police discovered the evil wizard's body riddled with bullets, because apparently that henchman wasn't taking any chances either. After two days they saw him on a beach having an entertaining vacation the shock killer all police officers who knew him. So his identity got scured and everyone forgot him.

This case is real it's still under studying