Mario Frieiro is an Argentine murderer who was sentenced on November 26, 2007 to life imprisonment for the murder of his wife in 1998.

A night in 1998, Frieiro had a discussion with his wife and attacked her with a handkerchief. He strangled and murdered her while the little son of the couple was watching the horrible crime that his father was committing against his mother.

After murdered her, Frieiro buried his wife under his bed and threatened to his son with the motive that he never say nothing about the crime. The boy didn't say anything until 2005 when he was a teenager. The ex-little boy but now a teenager broke in cry with his girlfriend and confessed that his father had murdered his mother.

Four hours later, Frieiro was arrested and accused of murder. When the son said it, the police went to the Frieiro's house and effectively, the police found the rests of a woman under Frieiro's bed. He was officially arrested and accused of murder.

The trial began on October, 2007. During one month, a lot of evidence was presented against Frieiro but the principal evidence was the testimony of his son, who was an unfortunately witness of the murder of his own mother. Also, Frieiro confessed the crime:

FRIEIRO: - "I loved her. For this I wanted that she returned with me and I forgave her at all times. But the life together with her was impossible. We had discussions at all times...at all times, but I was in love and I wanted that she returned with me. That night (was raining), I was cooking something while I was with Pablito (my son); at a moment, she enters to the house and came to me. So, I asked her: 'Where were you'? and she answered me: 'What's it matter to you?!' and she began to throw things against me. I had prepared the food, she throw the pan with oil against me, I burned me and in a moment, I was in a dangerous discussion."

"If you ask me if I murdered her with a gun, I don't know. If I stabbed her, I don't know. If she died by heart attack, I don't know. If I strangled her, I don't know. I got out, I had not cigarettes; I returned to the house and she was dead. I tried to save her, but she was dead. I spent three or four hours with the body but...... she was dead, hard and white like a paper."