On July 24, 2016, Carston walked up to Williams on North Cary Street and shot him several times at close range, including once in the face. Police said the 15-year-old called Gunsby just before the murder for final authorization.
Carston was convicted of murder, gang and weapons charges the following summer and sentenced to life in prison plus 45 years, prosecutors said.
Gunsby was indicted that fall by a Troup County grand jury.
During his trial, which started April 15 and ended Wednesday, deputies took a woman into custody after she allegedly recorded video and took pictures of witnesses on the stand, prosecutors said.
In other news:
Police said in a statement Friday that the suspect's home has been searched and the pellet gun has been retrieved. The investigation is ongoing.