|Location||The Old Bacchus Place|
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.
Mary Lou 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. As she is the same as all the other undead there, if you throw an explosive weapon such as a Fire Bottle or Dynamite, the Undead will attack or be killed.
|Hey there, cowboy. It looks like this little ol' article is a bit puny.|
I reckon you could impress me by adding to it. Don't be shy now.
If you're logged in, it'll help you earn them fancy achievements, too.