El Metro 4

Héctor David Delgado Santiago
Héctor David Delgado Santiago holding a G3 rifle
Born	23 December 1975 Matamoros, Tamaulipas, Mexico
Died	15 January 2013 (aged 37) Reynosa, Tamaulipas, Mexico
Other names	M4 El Metro 4
Occupation	Gulf Cartel leader
Predecessor	Samuel Flores Borrego
Opponent(s)	Los Zetas
Parent(s)	Armando Delgado and María Elvia Salgado

Héctor David Delgado Santiago (23 December 1975 – 15 January 2013), commonly referred to by his alias El Metro 4, was a Mexican suspected drug lord and high-ranking leader of the Gulf Cartel, a criminal group based in Tamaulipas. Born and raised in Matamoros, Tamaulipas, El Metro 4 initiated his criminal career by working with Los Metros, an enforcer gang of the Gulf Cartel.

After several years, his position in the cartel grew, and he later became the regional leader in Reynosa, Tamaulipas and the right-hand man of the drug lord Mario Ramírez Treviño. Although no official reports have been released, several media outlets alleged that El Metro 4 was found dead in Reynosa on 15 January 2013. The motives behind his murder are still unknown, but the two prevailing theories suggest that he was killed by the rival gang Los Zetas or betrayed by members of his own cartel.

Héctor David Delgado Santiago was born and raised in the Mexican border city of Matamoros, Tamaulipas on 23 December 1975. His father was a former customs broker in the area. He started his criminal career as a gang member for Los Metros, a muscle group of the drug trafficking organization known as the Gulf Cartel. As time passed, El Metro 4 became acquainted with some corrupt Mexican law enforcement officials, and his rank in the Gulf Cartel grew.

Delgado Santiago, unlike other drug traffickers of his time like Gregorio Sauceda-Gamboa (Metro 2) and Samuel Flores Borrego (Metro 3), managed to keep a low-profile by working alongside corrupt law enforcement and staying out of the Mexican and U.S. authorities' radar. At some point in his career, El Metro 4 worked as the regional boss of the Gulf Cartel in Reynosa, Tamaulipas and as the right-hand man of the current leader Mario Ramírez Treviño.