Goran Kostovic is a Serbian enforcer working for Nikola Corluka. He is involved in the Serbian mob smuggling operations working along Milena Jovanovic, unaware she's an undercover cop. He noticed the chemistry between Dylan and Jo and once he learned that Jo was a cop, he tried to kill them both while the apartment building was set on fire. Dylan managed to shoot him, but accidentally shot Jo at the same time. They were both rushed to Gaffney Chicago Medical Center, where, unfortunately, Jo died. Goran was able to be spared, primarily due to his brother, Bogdan, giving him a piece of his kidney.