Union County Sheriff's deputies have, along with other law enforcement agencies, arrested four neighbors of Adam Mayes, the man who killed himself after being found with missing girls Alexandria Bain, 12, and Kyliyah Bain, 8.
Ronnie Rich, 43, and his wife Tona Prince, were arrested for possession of a firearm by a convicted felon.
Their son, Jeffery Karr, was arrested on an outstanding warrant from the Mississippi Department of Corrections.
Richard J. Norman, 24, was arrested for a probation violation. All four live on Highway 9 in the Alpine community less than a mile from the home where Adam Mayes lived and where authorities found the bodies of Jo Ann Bain, 31, and her daughter, Adrienne Bain, 14, in a shallow grave.
Union County law enforcement didn't disclose how the four in custody are related to the Mayes investigation except to confirm they are.
Mark Gwyn, director of the Tennessee Bureau of Investigations, said Friday morning they are still investigating and conducting interviews to make sure anyone who assisted Mayes is brought to justice.
Mayes was found Thursday evening in the woods less than three miles from his house face-down in the woods with Kyliyah and Alexandria Bain.
Daniel McMullen, special agent in charge of the FBI Mississippi Division, said the girls were found uninjured.
They have since been returned home after being taken to Le Bonheur Children's Hospital in Memphis for observation.
Mayes' wife, Teresa, is being held in the Hardeman County Jail for two counts of first-degree murder and two counts of especially aggravated kidnaping. Mayes' mother, Mary, is being held for four counts of conspiracy to commit especially aggravated kidnaping.