Katee Sackhoff guest starts on Law and Order on December 3rd in the episode, "Knock Off".
Aceshowbiz provides details:
The "Knock Off" episode itself will revolve around a tourist from upstate New York who comes to the city to settle his past, but his trip ends quickly when he is suspiciously murdered. When detective Bernard and detective Lupo come to the city to investigate the murder case, they discover the involvement of Sheriff John Burkhart and his deputies on the murder. Meanwhile, D.A. Jack McCoy faces new competition when a new District Attorney is nominated for the election.
"Knock Off" will see Katee Sackhoff guest-starring as Dianne Cary when The NBC's crime drama series, "Law & Order", is aired on Wednesday, December 3, starting at 10/9c.
Here are some previews of Katee's work on L&O: