FORT WORTH (CBSDFW.COM) – A Tarrant County Grand Jury returned indictments Wednesday related to the March death of 4-year-old Stetson Blackburn.

Stetson Blackburn (courtesy of Fort Worth PD)

READ MORE: 'The Heroism They Demonstrated Was Extraordinary' Senator Ted Cruz Speaks In Colleyville After Hostage Standoff

Reyna Marie Sanchez and Shannon Gray were indicted on charges of capital murder of a child.

The Medical Examiner ruled the cause of death as blunt force injuries with complications.

Police said back on March 19, officers responded to a “medical call” at 3313 Bonaventure Blvd. S. where a 4-year-old boy was unresponsive and not breathing.

READ MORE: 5 Shannon High School Student In Birdville ISD Showed Symptoms Of Overdose, 1 Taken To Hospital

The child was rushed to Cook Children’s Medical Center and was pronounced deceased two days later after being declared brain dead.

The initial investigation by patrol officers identified the mother of Stetson as Shannon Gray and her girlfriend Reyna Marie Sanchez as the primary caregivers.

They were arrested on Friday, July 31.

Gray was arrested by Tennessee authorities; Sanchez was arrested by the Fort Worth Police Department Fugitive Unit.

MORE NEWS: Mesquite Police Chase Ends After Suspect Runs Out Of Gas

Reyna Marie Sanchez (CBS 11)