José Manuel Martínez, known as "El Mano Negra," was a
Mexican-American hitman who confessed to killing 36 individuals
across multiple states over several decades. Born on June 13, 1962,
in Fresno, California, Martínez's early life was marked by tragedy
and exposure to criminal elements. He claimed his first killings were
acts of personal vengeance for his sister's murder, which set him on
a path to becoming a contract killer for Mexican drug cartels. His
criminal activities spanned fro...
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