Tangipahoa Parish investigators are making progress in a complicated case that involved three murders in two days in early June.
Someone shot and killed Charleston Mitchell and Randy Bickham on Haynes Lane in Natalbany on June 2. The next day, deputies found Marquise Lightfoot shot to death in the same neighborhood.
Investigators recently booked Antoine Schaffer, 22, and his grandmother, Debra Knight, with accessory to first-degree murder and obstruction of justice in the Lightfoot murder case.
Antoine Schaffer is being held on $1,050,000 bond.
Schaffer's mother, Letanya Schaffer has also been booked with obstruction of justice by providing false information hindering a police investigation.
Detectives say her other son, who is 15 years old, was arrested last month and charged in the deaths of Mitchell and Bickham.
Investigators say they expect to make additional arrests in the case.