Leon Cornwell is one of the U.S. Marshals that can be selected under the "Marshals" category in the Outfitter. The Marshals category was unlocked without restrictions by Rockstar Games on October 1, 2010 on all systems.
- "So, you a bumbuler or a booger?"
- "Just keep shooting arrows into apples."
- "They filming a motion picture? So many actors here."
- "Where's the camera? This is a motion picture set, right?"
- "You got the wrong man! The bill show is the next town over."
- "Looks like crossfield gets to do a little town clean up!"
- "Crossfield seems smoother than you!"
- "You ain't worth a rat's ass!"
- "Didn't think there were so many childrens entertainers this far out!"
- "Great! Guy can now clean the town, all it wants."
- "What's this? The understudies from the bill show?"
- "I heard the school barn is looking for some rainy day clowns!"
- He has the same quotes as Darren Ward.
- He shares the same character model as Earl Hollingsworth.
- He makes a reference to Guy Crossfield from Single Player.
- He was originally intended as a reward for a collective Multiplayer Social Club Challenge called I Shot the Sheriff, which has since been scrapped.