(CNN) -- The sister of De'Marquise Elkins -- one of the two teenage boys accused of fatally shooting a 13-month-old baby in Brunswick, Georgia -- has been arrested in connection to the case, authorities said Thursday.
Sabrina Elkins, 19, is accused of tampering with evidence in the killing of the boy, who was shot March 21, the Glynn County Sheriff's Department told CNN.
This week, police also arrested 17-year-old Elkins' mother, Karimah Aisha Elkins, 36, and aunt, Katrina Latrelle Elkins, 33, who are accused of making "false statements or writings," among other charges.
Katrina Elkins also was held for an unrelated probation violation.
A grand jury has indicted De'Marquise Elkins and Dominique Lang, 15, prosecutors announced Wednesday. Elkins faces malice and felony murder charges. Lang is accused of felony murder.
CNN is identifying Lang because he is charged as an adult and media in the community have been naming him since he was arrested.