Norma Bustos was attending her shop around 10 a.m., when a man pretending to be a client approached her, shooting her three times in the chest, killing her instantly.

Since 2008, Bustos has been informing the local media about the criminal groups that were terrorizing her neighborhood. Last year, her only son, Lucas Espina, 26, was assassinated on at the corner of her house. The investigation found later that Lucas, who was helping his mother to prepare pizzas, was actually killed by mistake.

“I know that with drugs, you can pay anything. I am not afraid that they could shoot at me because since this Saturday [January, 27, 2013], I am already dead. That is why I tell them: come and kill me. They will be killing a corpse because I have been dead for a while,” she told the blog Trabajo Cronico shortly after her son's death.

Prosecutor Ademar Bianchini launched an investigation, although witnesses so far have been reluctant to give any information.

Thus far, Brothers Milton and Jose Damario, whom have proven links to local drug traffickers, were prosecuted for the murder of Ms. Bustos’ son.