Mexican authorities confirmed the body was found in San Fernando among 193 corpses recovered from a mass grave near the border of Texas in April, El Universal reported Wednesday.
Officials said the victim was allegedly killed after being pulled from a bus by the Los Zetas drug gang.
Authorities declined to identify the victim because there has not been authorization from the family.
More than 70 suspects have been charged in the killings, including several police officers who allegedly aided the gang.
Many of the victims buried in mass graves were migrants heading to the United States, officials said.
The Zetas gang is a drug-trafficking organization that recruits migrants to fight rival gulf cartels.