Roberto del Fierro Lugo, former marketing manager of Mexican musician Jesus "El Flaco" Elizalde, died early Wednesday after he was shot on Tuesday in Guadalajara, Mexico.

Del Fierro Lugo, 47, died from a single shot to his head, the newest in a string of attacks that have driven fear into the heart of Mexico's music industry.

Jesus "El Flaco" Elizalde's brother, Mexico's singer Valentin Elizalde, was killed last year.

"We are sad because he was a friend of ours," said Tenoc Espinosa, "El Flaco" Elizalde's manager, who said del Fierro's killing didn't have anything to do with his work with the musician.

Del Fierro's death comes one month after a murderous wave took the lives of several Norteña music stars, among them Sergio Gómez, lead singer of the Grammy-nominated band K-Paz de la Sierra.

Valentín Elizalde, known as "El Gallo de Oro" and brother of "El Flaco" was shot on November of 2006 after a show in Reynosa, across the border from McAllen, Texas.

He was one of the first singers murdered in a series of violence acts towards the Norteña music community.

A month later, Javier Morales Gómez of Los Implacables del Norte was murdered in the western state of Michoacán.

Last December, Sergio Gómez was killed after being abducted and tortured in Michoacán.

During the same month were also murdered grupera singer Zayda Peña, in the northern state of Tamaulipas, and a trumpet player from the band Los Conde in the southern state of Oaxaca.