Mary Lou

 is a minor, deceased character featured in the Red Dead Redemption Undead Nightmare DLC pack.

Background
No background information is known for "Mary Lou". In fact, her name was given to her by Seth Briars and could be completely inaccurate to what her name was when she was alive.

Interactions
appears at the party thrown by Seth Briars at The Old Bacchus Place in the final cutscene of the mission "Get Back in That Hole, Partner". The player does not interact with her but watches as Seth dances a jig with her.