Stephanie Grayson is a nurse who worked at the hospital where the brother of Officer Luke Edmunds lost his brother to a drug overdose. Stephanie pitied Edmunds since his brother Bobby is all he had after their parents died, and as they got to know each other, they eventually dated. Edmunds helped Stephanie by paying for bills, and Stephanie was a shoulder to cry on got to hear firsthand how Edmunds hated drug dealers for taking his little brother away from him.
What Stephanie never knew is that Edmunds was guilty of murdering numerous drug dealers after Bobby died as revenge and in hopes of keeping New York City safe. Stephanie was questioned when it was revealed his partner, Les Cooper, was his accomplice and assisted Edmunds just for payment from yet another drug dealer, Hector Ramirez.
Edmunds was shaken from killing Javier Vasquez, one of the dealers he killed with Cooper's help. Grayson heard Edmunds tell a lie of he was trying to catch Vasquez with his history of recidivism, but he killed Vasquez when he pulled a knife. Grayson tried to reassure him by saying drug dealers could kill someone else's loved one if it weren't for Edmunds' job. She didn't realize she unwittingly was speaking to an account of Edmunds' serial vigilante killings and thought nothing of Edmunds feeling better other than he wasn't grieving. (SVU: "Rotten")