The Most Dangerous Serial Killer In US History !

The most unusual Serial Killer Case In US History ! This documentary explores the shocking case of José Manuel Martínez — also known as “El Mano Negra” (The Black Hand) a former self-proclaimed cartel hitman who confessed to killing around 36 people across at least 12 U.S. states over three decades. His crimes were largely connected to drug cartel debts and power conflicts. After his arrest in 2013 for the murder of Jose Ruiz, authorities uncovered his long history of killings through interrogation and investigations across multiple states including Alabama, California, and Florida. He received multiple sentences: 50 years in Alabama Life imprisonment without parole in California Two consecutive life sentences after a Florida trial in Florida He is currently incarcerated at USP Victorville. The case became widely discussed because of the contrast presented in court prosecutors portrayed him as a cold-blooded killer, while family members described him as a caring father and grandfather. This dual narrative made the trial emotionally powerful and legally significant. Full victim list and timeline explained in the video. If you found this documentary insightful, support the channel by liking, sharing, and subscribing for more true crime investigations. Subscribe for more deep investigative documentaries! #TrueCrime #SerialKillerCase #ElManoNegra #CrimeDocumentary #MexicanCartel #USCrimeStories #DarkHistory #JusticeSystem #CrimeInvestigation #TrueCrimeCommunity