Det. Russell and Alex in “Unfinished Business”

This is the first time you mention what you did when you were gone. :[pauses] Why all the secrecy? I was your partner, Alex, I know how hard it was for you.

Do you remember the guy I became after Lucy was kidnapped?

You mean the guy Chicago P.D. decided to ease into a half pension so he wouldn't screw anything else up? That guy is kindda hard to forget.

Well, let's just say I got worse before I got better.