Dr. Gidry is an anesthesiologist who appeared on Bloodstream. She was revealed as the one who killed Dr. Micah Newton, who found out about Gidry siphoning drugs for her own use and threatened to fire her. Gidry killed Newton with a golf club while confronting him.
Gidry was caught after Jane created a ruse where he announced that he drugged the doctors' coffee. She was found in the bathroom by Lisbon, who informed Gidry that it was a set-up to catch her.