After deliberating most of Friday, a Pima County jury decided a Tucson man intentionally stabbed his teen girlfriend to death but did so without premeditation.

Carlos Torres, 20, was convicted of second-degree murder and is facing a minimum of 10 years in prison when sentenced Dec. 10. Prosecutors had sought a first-degree murder conviction.

Torres waived his right to let the jury decide if aggravating factors exist that could enhance his sentence to as much as 22 years. The decision will be made by Pima County Superior Court Judge Richard Fields.

Prosecutors Kellie Johnson and Kendrick Wilson intend to argue that Torres is eligible for the maximum sentence because he killed Ignacia Aranda, 17, in the presence of their 18-month-old daughter, because of the emotional harm to Aranda's family and because of the nature of the murder itself.

During opening statements, Johnson told jurors that Torres and Aranda argued on Aug. 8, 2011, because Aranda had gone through Torres' belongings while he was visiting another girlfriend.

At 8:30 a.m. Aug. 9, Torres called the other girlfriend and told her Aranda had stabbed herself to death, Johnson said. The girlfriend called Torres' mother, who called 911. When detectives arrived, they discovered Aranda had been dead for hours, Johnson said.

An autopsy revealed Aranda had been stabbed in the face and neck between 19 and 25 times.

Assistant Pima County Public Defender Adam Page told jurors Aranda found a "Girls Gone Wild" video while Torres was away and they argued about it.

Page and fellow defense attorney Michael Rosenbluth argued the slaying wasn't premeditated but a crime of passion.

According to testimony, the couple began a tumultuous relationship when Aranda was 13 and Torres was 15. Aranda and their daughter moved in with Torres just a few days before the slaying.

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Torres, who has an IQ of 51 and is considered intellectually disabled, paid for his rent at the Retro City Apartments, 2475 N. Haskell Drive, with his disability checks, his mother testified.

Torres' other girlfriend, 15, testified she thought Torres and Aranda had broken up and Aranda was living with him because her mother had kicked her out.

On StarNet: Follow the news and events at Pima County's courthouses in Kim Smith's blog, At the Courthouse, at azstarnet.com/courthouse

Contact reporter Kim Smith at 573-4241 or kimsmith@azstarnet.com