Following a month of performing in the International Wrestling Association, Cosme returned to AAA in a special event presented by the company, this time under the ring name of El Mesías.

While working in Mexico, Cosme signed a contract with Total Nonstop Action Wrestling (TNA) where he debuted as Judas Mesias on September 13, 2007.

During this time, he was enrolled in the Interamerican University of Puerto Rico located in Bayamón, his major concentration was in computer technology, after completing two years of study, he decided to begin wrestling as a profession after meeting Víctor Quiñones in the gym.

In 1997, after working in the independent circuit he moved to Mexico and performed there and became involved in a project to develop Hispanic talent organized by the World Wrestling Federation.

[7][8] Cosme's gimmick underwent another change when it joined then-dominant heel stable "La Compañía" led by Savio Vega.

In 2005, he turned heel again, this time leading a stable known as La Cruz del Diablo which feuded with other groups led by Savio Vega and Ray Gonzalez.

He debuted on March 12, 2006, as "Muerte Cibernética" a rudo (villainous) enforcer supposedly brought to the company by Cibernético to feud with "La Parka".

[13] On November 29, 2007, he successfully defended the company's championship in a triple threat match at a pay-per-view titled Guerra de Titanes.

[18] On December 6, 2008, at Guerra de Titanes, Cosme won the AAA Heavyweight Championship for a second time, defeating El Zorro (Jesús Martínez).

[23] On October 1 at Héroes Inmortales IV El Mesías gained a measure of revenge on Aguayo by defeating him in a singles match.

[26] Afterwards Mesías entered a feud with La Sociedad member L.A. Park, who defeated him on December 5 at Guerra de Titanes, after using a chair on him.

[31] On October 9 at Héroes Inmortales, El Mesías wrestled TNA performer Sting to a no contest in what was billed as a "dream match" by AAA, following interference from La Sociedad.

The match had been put together by AAA Mega Champion Jeff Jarrett in an attempt to stop El Mesías from chasing his title.

[40] The partnership was ended on December 8 at Guerra de Titanes, when Aguayo turned rudo, leading to the reformation of La Sociedad.

[41] On August 17, 2014, at Triplemanía XXII, El Mesías won fellow técnico Electroshock's hair in a six-way steel cage Lucha de Apuestas.

[44] On May 26, 2017, Mesías and Pagano won the AAA World Tag Team Championship after defeating Dark Family (Cuervo and Scoria).

[45] Cosme participated as Banderas in the Wrestling Society X television series (taped in Los Angeles, California), with the gimmick of a disgruntled and kayfabe disfigured man pursuing a feud with Vampiro.

[46] The booking of the feud commenced after Banderas threw a fireball at Vampiro's face, which resulted in MTV pulling the episode from its original airdate, with concerns that viewers would try it at home.

[50] On September 21, 2007, it was reported that Cosme was suffering from sciatica and that the condition's treatment required several weeks of rest, followed by physical therapy to recover.

[55] At the tapings of the following day's Hardcore Justice 2 pay-per-view, Mesias, once again managed by James Mitchell, was defeated by Joseph Park in a Monster's Ball match.

[57] The promotion made the official announcement two days later, including highlights of his career in a compilation video displayed during a special event titled Crossfire.

[59] On January 8, 2011, Banderas defeated Colón, with help from an interfering Shane Sewell, to win the WWC Universal Heavyweight Championship for the first time.

His sole match took place on April 2, 2011, where he defeated González, who had since returned to his masked "Rey Fénix" persona, in the main event of the evening.

[61] Following this match Cosme's involvement in the IWA concluded, remaining inactive in Puerto Rico until January 7, 2012, when he reappeared in WWC programming asking for an opportunity to challenge Carly Colón for the Universal Heavyweight Championship.

The challenge was accepted and took place at Euphoria 2012, but was inconclusive after Savio Vega interrupted by distracting Colón, which drained what was left of the preestablished time.

[3] In storyline, Muertes' real name was Pasqual Mendoza, whose entire family died in an earthquake in Mexico City, when he was seven years old.

[69] In January 2021, Muertes made his Major League Wrestling debut, accompanied by Salina de la Renta as his valet.

This streak continued with wins over Parrow and Gringo Loco, receiving his first loss after challenging Alexander Hammerstone for the MLW National Openweight Championship.

When “El Jefe” was revealed to be Luis Fernandez-Gil (now known as César Durán, with “Dario Cueto” being explained as one of his many pseudonyms) and De la Renta concluded her run within the promotion, he continued working for Azteca Underground in its quest to “build a new temple”.

The first defense of this title took place at Fightland, where he defeated former MLW World Heavyweight Champion Tom Lawlor in a casket match.