uoihiuhHe started working for The Tijuana Cartel in 1995 under the orders of Ramon Arellano Felix. When the Tijuana Cartel leader Eduardo Arellano Félix was arrested on October 25, 2008, a violent power struggle erupted between Teodoro García and Luis Fernando Sánchez Arellano over the leadership of the Tijuana cartel. Teodoro García left the organization, formed his own gang, and forged an uneasy alliance with rivals The Sinaloa Cartel. When splitting from The Tijuana Cartel, his faction engaged in a war with it, which caused violent crime in Tijuana to increase significantly. According to Tijuana's Chief of Police, García was principally responsible in the late 2000s for the increase in the number of homicides in the city.
Teodoro García is best known for running an extortion and kidnapping network, and is also known for dissolving the bodies of those who are in business with rival drug gangs by drowning them in sodium hydroxide. Upon being arrested, García's lieutenant —Santiago Meza López— claimed to have dissolved over three hundred bodies in this fashion in 2008. The Mexican Army stated that it believed Meza's claims to be true.
The Mexican Federal Police was offering a $2 million USD bounty for information leading to the capture of Teodoro García Simental. García Simental was also wanted by the U.S. Drug Enforcement Administration (DEA).
Teodoro García Simental was arrested on January 12, 2010 by Mexican Federal Police in a luxury home complex named Fidepaz, located in La Paz, Baja California Sur. He was arrested together with an individual by the name of Diego Raymundo Guerrero García.
One month after his arrest, on February 7, 2010 Manuel Garcia Simental, Teodoro’s younger brother and lieutenant, was arrested in the Baja California port city of La Paz. Authorities feared Manuel was planning to reignite a gang war for control of Tijuana’s drug trafficking routes.