A suburban Chicago teen accused of fatally shooting his 17-year-old girlfriend, a 9-year-old girl and the child’s father was told Thursday a grand jury has indicted him on three charges of first-degree murder.

Byrion Montgomery, 17, of Bolingbrook, went before a Will County judge and was informed that the grand jury indicted him in the March 5 slayings of 40-year-old Cartez Daniels, 17-year-old Samiya A. Shelton-Tilman and Sanai Daniels, 9.

Judge Dave Carlson told Montgomery, who is currently being held at the River Valley Juvenile Detention Center in Joliet, that he will be transferred to the Will County Jail after he turns 18 on April 27, the Arlington Heights Daily Herald reported.

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Carlson also granted an order to have Montgomery submit to DNA testing.

17-year-old Bryion Montgomery, above, was charged on March 6, 2023, as an adult with multiple crimes, including first-degree murder. (Bolingbrook Police Department via AP)

The 13-count indictment contained the same adult charges that were filed against Montgomery on March 6. They include multiple counts of first-degree murder, attempted first-degree murder, home invasion, aggravated battery and aggravated unlawful use of a weapon.

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Montgomery has pleaded not guilty. He is being held in lieu of bail set at $20 million.

The attempted murder charge stems from the shooting of Tania Stewart, 34, the fiancee of Cartez Daniels and mother of Shelton-Tilman and Daniels. Stewart survived.

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The shootings took place in Bolingbrook, about 30 miles west of Chicago.

Police have said Shelton-Tillman and Montgomery dated.