Sneak Peek at Kathy Najimy on Desperate Housewives

Susan's past comes back to (hilariously) haunt her this week on Desperate Housewives.

When the character suspects Katherine of having attacked Julie, she hired a has a cop investigate her suspicions. Just one problems:

Susan stole this police officer's boyfriend in high school! Watch guest star Kathy Najimy in action in the following clip from Sunday's "Careful the Things You Say."