Cameron James Pettit is accused of selling the late Miller fake percocet laced with fentanyl and cocaine.
Atlanta police responded to an altercation involving a woman.
Jung Joon-young, Choi Jong-hoon, and Yong Jun-hyung have quit entertainment.
One of K-Pop’s most influential idols now faces three years behind bars.
Prosecutors said they could not move forward due to the “alleged victim’s refusal to cooperate.”
“It offers no consolation, closure, or assurance that this kind of accident will not happen again,” the statement reads.
Los Angeles D.A. says the actor was not to blame for the highly publicized incident.