Mike Conlon: They should have locked you up a long time ago. Made you pay for the things you did.
Jimmy Conlon: Just because I'm not behind bars doesn't mean I'm not paying for what I did, Michael.
Jimmy Conlon: I'm giving you one more chance to walk away from this.
Shawn Maguire: You're giving me one more chance?
Jimmy Conlon: That's right. As long as you're coming after Michael, I'm coming after you. Walk away, Shawn.
Shawn Maguire: Walk away to what, Jimmy? Huh? Ain't got nothing left to walk back to anymore.
Jimmy Conlon: This is between you and me. Leave my son out of it.
Shawn Maguire: Fuck you.
Jimmy Conlon: Then we do like you always said. We cross that line together. Right now.
Jimmy Conlon: The things I did, the things I've seen, it becomes who you are. You can't just go home and scrub it off. The only way I could protect you was to walk away. Forget about you and your mom. I wanted a better life for you than the one I chose for myself.
Shawn Maguire: Tell everyone to get ready. Jimmy's coming.
Chosen answer: It is the list of all the people he killed during his tenure as the "muscle". He promised the list to the detective if the detective agrees to protect his son.