Mexican police have arrested a suspect linked to notorious American-born drug kingpin Edgar Valdez Villarreal, alias "La Barbie," who was captured in 2010, the federal Public Safety Secretariat said.

Jose Ubaldo Montemayor Gonzalez, who is the subject of a U.S extradition request, was arrested Thursday in the central state of Queretaro.

The suspect is the brother of Valdez Villarreal's father-in-law and successor, Carlos Montemayor, who was detained in November 2010, the secretariat said Friday.

According to police investigations, the 48-year-old Montemayor Gonzalez, who also went by the name Jesus Jose de la Garza Garza, worked at a trucking firm owned by his brother in Laredo, Texas.

Both brothers are charged by a court in Atlanta with criminal conspiracy and possession of cocaine for intended distribution, as well as criminal conspiracy to launder and transport money from drug trafficking.

Montemayor Gonzalez is being jailed in the western state of Nayarit while Mexican authorities decide on the United States' November 2010 request for his extradition.

Authorities say the 39-year-old Valdez Villarreal, a native of Laredo whose nickname refers to his leading-man good looks, was responsible for smuggling a ton of cocaine per month into the United States and also was behind dozens of homicides as chief enforcer for the Beltran Leyva drug mob.

At the time of his capture in August 2010, Valdez Villarreal was fighting for control of the Beltran Leyva outfit, which had been broken apart by the death of cartel boss Arturo Beltran Leyva in late 2009.

Drug-related violence in Mexico has left some 60,000 dead nationwide since December 2006, when President Felipe Calderon took office and militarized the struggle against the nation's well-funded cartels. EFE