Eduardo Arturo Vázquez

Cromañón and Taddei's murder On 30 December 2004, while Callejeros was giving a concert at the República de Cromañón nightclub in Balvanera, a fire engulfed the building after a spectator threw flares, which impacted a cloth net in the ceiling. The fire spread quickly, causing Argentina's worst non-natural disaster. A total of 194 people died, and thousands of others were injured. Vázquez's mother, Dilva Lucía Paz, died in the fire, which left him profoundly affected. The tragedy in Cromañón left Vázquez dealing with post-traumatic stress disorder; he moved to Córdoba soon afterwards and said he was considering suicide when his daughter Valentina was born, making him change his mind.

Vázquez's trial for the murder of his wife was delayed when, in April 2011, the Court of Cassation revoked the acquittal of Callejeros band members in the Cromañón case and ordered a review. They were subsequently tried again, this time being convicted for their role in the fire. On 17 October 2012, Vázquez was sentenced to six years in prison for Cromañón's case. By the time of his sentencing in the nightclub fire, Vázquez's trial for Taddei's murder had already concluded. In 2016, the Supreme Court finalized the proceedings against Callejeros, upholding their convictions.

The first instance of Vázquez's proceedings began on 28 February 2012 and finished on 14 June when he was found guilty under mitigating factors related to violent emotions that Vázquez allegedly felt and acted on in the killing. This time, his defense announced an appeal to the Court of Cassation, which accepted hearing the case on 7 November 2014. The tribunal took nearly two years to file a verdict; in September 2016, the Court of Cassation concurred with the state and upheld Vázquez's life sentence, arguing that he had been involved in a violent relationship with Taddei. During his stay in Ezeiza, Vázquez shared cell with Jorge Mangeri, serving a life sentence for the June 2013 sexual assault and murder of 16-year-old Ángeles Rawson in Palermo, Buenos Aires. While the guarantees court approved his transitional release, the Federal Penitentiary Service, the Public Safety Ministry, and Taddei's family issued a statement opposing the move, considering that Vázquez is not fully rehabilitated.