A 29-year-old man already charged with two counts of first-degree murder faces additional felony charges after the return of a grand jury indictment Friday, Jan. 9.

In July, prosecutors filed murder and arson charges against Justin Ray Carr after the deaths of Carr’s 85-year-old grandmother, Elizabeth Rae Boggs, and her 64-year-old son, Michael Gary Boggs.

Carr now faces additional charges: two counts of second-degree murder, and a felony charge for unlawfully manufacturing a destructive device. The additional murder charges list the same two relatives of Carr as victims.

Prosecutors have alleged that Carr intentionally set a fatal fire July 9 at a Springfield mobile home park that killed two of his relatives. A police affidavit stated that investigators found two glass bottles with cloth in them inside the mobile home where the fire took place, with the court filing describing the bottles as Molotav cocktails.

Carr has a trial date set for Oct. 27. In a separate court case, Carr has been charged with an attempted jail assault that prosecutors say took place in August.