He once held the Mexican National Middleweight Championship and after his retirement was the head of the Mexico City boxing and wrestling commission for a while.

Jesús Velázquez made his professional wrestling debut on April 3, 1938 in the original Arena México, working for Empresa Mexicana de Lucha Libre (EMLL).

His entrance theatrics would at times include him hiding a couple of live bats under his vest, releasing them in the arena during his in-ring introduction, letting them fly free among the audience.

[3] His rough, brutal in-ring wrestling style added to the aura of El Murciélago Enmascarado, quickly pushing him up the rankings as he was wrestler that drew fans by the fact that they wanted to see him lose.

[4] During the early parts of his career Velázquez also worked as a policeman, both to make money but also to gain access to the Casino de la Policia training facilities to further his physical abilities in the ring.

[2] In 1940, EMLL began a storyline between El Murciélago Enmascarado and Octavio Gaona that would lead to one of the pivotal moments of the early years of lucha libre.

[5] The storyline between played out in a way that the brutal rudo Murciélago drew the normally more technical Gaona into a series of brawls, matches that often ended inconclusively.

[1] On July 14, 1940, Gaona defeated El Murciélago Enmascarado, forcing him to unmask after the match and reveal his birth name, something that became a lucha libre tradition.

[5][7] After being unmasked he modified his ring name to Murciélago Velázquez and continued to be a hated rudo wrestler as his natural charisma was even more obvious without the mask.

[4][8] By the end of the year, other Mexican wrestlers, such as El Santo rose to the top, relegating Murciélago Velázquez to the lower ranks, working shows all over Mexico but not making as many headlines as his heyday from 1937 through 1942.

The final movie he wrote the story for, La mujer del diablo ("The Devil Woman"), opened in 1974, a year after Velázquez' death.