Investigators said 27-year-old Zipporah Purvis tried to help the suspects evade arrest. She is being held in the Pitt County jail under a $3 million bond.
"In any investigation, if you conceal information about the crime, or you help the suspect in any way allude arrest, then you are an active participate," said Pitt County Sheriff Neil Elks.
Monday, Antwan Anthony, Xavier Shamble, and Willie Whitehead were all indicted on three counts of murder, kidnapping, and robbery for the homicides.
Nabil Almoganahi, David Alawi, and Sam Almoganahi were shot and killed April 1 at the Hustle Mart during a robbery. All were related.
A juvenile was also arrested but investigators are not releasing information about him because of his age.