According to security forces, Velázquez was a senior member within Los Ántrax, one of the Sinaloa Cartel's assassin squads responsible for fighting rival gangs, guarding drug shipments, and protecting the family of Ismael "El Mayo" Zambada, one of Mexico's most-wanted men.

Originally a truck driver in Sinaloa, he was recruited by Los Ántrax in 2008 and became a trusted member due to his adept combat abilities in the field.

He was arrested later that year after turning himself in to allow his boss José Rodrigo Aréchiga Gamboa (alias "El Chino Ántrax") to escape during a shootout.

Several singers and music groups wrote songs detailing his personal life, including Larry Hernandez, Gerardo Ortiz, Ariel Camacho, Enigma Norteño, Jorge Santa Cruz, and Los Nuevos Rebeldes.

[10][13] Velázquez oversaw the street drug distributions in southern Culiacán, Sinaloa before becoming a dedicated squad member of Zambada's family security force.

[9][15] When he joined Los Ántrax, he shaved his head and grew his beard to show loyalty to El Vicentillo, his former boss and friend.

[9] As a high-ranking member, he reported directly to Aréchiga Gamboa and Eliseo Imperial Castro (alias "El Cheyo Ántrax").

Velázquez gained the trust of his superiors due to his successes at leading Los Ántrax during offensive operations, and for his violent methods and tactical strategies in the field.

[18] With the arrest of El Vicentillo in 2009, the Sinaloa Cartel instructed Velázquez to form a perimeter of scouts across in Culiacán Municipality.

[14] Shortly after joining Los Ántrax, Velázquez was involved in a shootout with the Mexican Army in Culiacán that resulted in his arrest.

He was arrested along with his brother José Fidel Velázquez Valenzuela, Francisco Angulo Estrada, and Marco Antonio López Armendáriz.

[19] Velázquez told law enforcement that the weapons were owned by Octavio Villarreal (alias "El Salchi"), a friend of his.

He tried to explain to law enforcement that his brother José Fidel was with him because his car would not turn on and he helped him get it to a mechanic, who he claimed was López Armendáriz.

[19] Velázquez remained in prison until 22 August 2014, when Sinaloa district judge Alba Lorenia Galaviz Ramírez granted his release.

[31] After arriving at Las Quintas, the Army discovered that several leaders of Los Ántrax, including Velázquez, were at a home gathering.

[9] When they noticed law enforcement's presence, several members of Los Ántrax attempted to flee the scene in their vehicles;[9] others tried to escape by running across the rooftops and yards of the neighborhood's houses.

Velázquez was killed by gunfire; his corpse was found covered in gunshot wounds inside a red armored Toyota Tacoma.

[23] At the scene, the Army requested support from the Criminal Investigation Agency (AIC), a branch of the Attorney General's Office (PGR), to help gather evidences and carry out other legal procedures.

The PGR stated that they would open an investigation against those involved in the shootout for violating Mexico's Federal Law of Firearms and Explosives.

[50] Investigators highlighted that operatives like the one that resulted in Velázquez's death were part of a larger military-led campaign headed by the federal government since 30 September 2016, when gunmen of the Sinaloa Cartel ambushed and killed five soldiers of the Army in Culiacán.

Other neighbors, who spoke on the condition of remaining anonymous, told the press that Velázquez and others were not armed and were likely extrajudicially killed, in an apparent tit-for-tat for previous attacks against the Army.

[43] The press also received information from anonymous sources that the Army found out about Velázquez's location from an unknown tip, which they believed suggested he was likely betrayed by someone in the Sinaloa Cartel.

[54] A crowd of friends and family members walked along the hearse and played tambora as they headed to El Salado's church, where a ceremony was held.