As Antonio recovers from the shooting, Dawson visits Voight in prison to ask about the gang activity. She is told to look for someone named "T.T." but is now obligated to help Voight. She finds T.T. who threatens her with a gun to never return. Casey learns Dawson visited Voight and is upset with her. Later, T.T. sends a girl to visit to Dawson. She wants to testify against the ones who shot Antonio. Casey's mother finally confesses to him that she killed his father for something he said about Casey. Whaley insists Severide contact his sister Renée. Severide tracks down his ex-fiance, who is now working as a stripper and doesn't want anything to do with him. Whaley later finds out that Renée overdosed and was rushed to the hospital. He calls Severide to tell him the news.