The brother of Mexican ranchera singer Pablo Montero was murdered in Torreon, a city in the northern state of Coahuila, but the motive has not been determined, prosecutors said Thursday.

The body of Javier Hernandez Rodriguez, who was around 45, was found at 1:45 p.m. Wednesday on a downtown Torreon street, the Coahuila Attorney General's Office said in a statement.

Hernandez Rodriguez was stabbed to death, the AG's office said.

The victim, who worked as a stylist, is the brother of Pablo Montero, a popular telenovela actor and ranchera performer whose real name is Oscar Daniel Hernandez Rodriguez, media reports said.

Montero lost another brother in a shootout on a Coahuila highway in 2010.

Condolence messages flooded social-networking sites after the news broke of the death of Montero's brother.

"Thank you for the support and for your prayers," Montero said in a post.

Investigators are trying to determine who killed Hernandez Rodriguez and what the motive was, the AG's office said.

A number of performers of narcocorridos, ballads that recount the exploits and travails of drug kingpins, have been murdered in northern Mexico in recent years.

Coahuila has been at the center of a turf war among the Los Zetas, Gulf and Sinaloa drug cartels in recent years, leading to a spike in violence in the state. EFE