The 17-year-old accused in the deadly shooting at a Fairfield Spirit Halloween store now faces a second murder charge, for the death of the victim's unborn child, ABC7 News reported.

It came out in juvenile court Wednesday that Constance Hages, 31, a mother of four, was 13 weeks pregnant. That allows prosecutors to pursue the second murder count. NBC Bay Area reported that the teen is charged with two counts of murder, three of attempted murder and three of felony assault with a semi-automatic weapon. Six other people were wounded.

Chief Deputy District Attorney Bruce Flynn told the judge the teen had a prior weapons case and had been convicted of firing a gun outside a North Bay high school. He was on probation at the time of the shooting, Flynn said. Prosecutors believe he saw someone in the store he had an ongoing dispute with and opened fire while more than 100 people, including children, were inside.

The Solano County District Attorney's Office has asked to try him as an adult. "The difference between adult court and juvenile court for this individual means the potential for a life sentence versus getting out when he's 25 years old," legal analyst Steven Clark told ABC7. Only a juvenile court judge can approve the transfer, which could take months. The teen is being held in juvenile detention.