Capitol Offense is the third episode in Season Six and also the 116th episode of the entire NCIS series.
When a Lieutenant Commander who was having an affair is found dead, Gibbs finds that the affair was with Senator Patrick Kiley, a former Marine officer who served with Gibbs. It seems like an open and shut case for the team but not everything is what it seems while Abby embarks on her own personal investigation to find out who stole her cupcake.
Two cyclists are busy cycling through a forest, obviously in competition with each other as they pass through various areas of the forest.
David states that ten bucks will say that he'll beat Tiffany to the car.
"Make it 20", Tiffany says.
With that, the two resume their cycling, David in the lead and Tiffany behind him.
David takes a wrong turn and after crashing into a log, ends up falling into a lake or swamp.
Seconds later, Tiffany arrives, obviously careful not to fall for the same trick. She then calls out to David that she guesses that he now owns her twenty bucks.
In the swamp or lake, David just rubs his nose while behind him, a body emerges.
"Oh my God", Tiffany states before calling David's name.
This has David turning back, glancing at the body and then going "Whoa" as he jumps back, startled.
It then cuts to the body which is female and wearing the uniform of a Navy Lieutenant which is now floating on the water.
Cole Erickson's apartment has now become a crime scene and there's a hive of activity as Ducky removes the plastic bag from Erikson's head while the others begins processing.
McGee tells Gibbs that the suicide note was written and printed on the computer and as Gibbs bags something, DiNozzo wanders in, announcing that Erickson's Grand Cherokee is still in its parking space and that it's being towed to the Evidence Garage before telling ZIva it looks like she was wrong about Reed Talbot.
"He's still a crumbbag", Ziva says, causing Tony to throw his hands up in dismay, presumably at the fact that Ziva got the word, "crumbbag" mixed up with "scumbag".
|Leroy Jethro Gibbs||Mark Harmon||NCIS Special Agent in charge of the NCIS Major Case Response Team.|
|Anthony DiNozzo||Michael Weatherly||Senior Special Agent and second-in-command of the NCIS Major Case Response Team.|
|Ziva David||Cote de Pablo||Mossad/NCIS Liaison Officer and a member of the NCIS Major Case Response Team.|
|Timothy McGee||Sean Murray (actor)||Junior Special Agent of the NCIS Major Case Response team.|
|Abigail Sciuto||Pauley Perrette||Forensic Specialist associated with the NCIS Major Case Response Team.|
|Leon Vance||Rocky Carroll||Director of NCIS.|
|Donald Mallard||David McCallum||Chief Medical Examiner associated with the NCIS Major Case Response Team.|
|Debra Green||Sheila Frazier||A reporter for ZNN.|
|Senator Patrick Kiley||Tim DeKay||United States Senator who served in the military with Gibbs.|
|Lynn Tripp Kiley||Susan Floyd||Wife of Senator Kiley. She shot Debra Green, claiming it was an accident.|
|Cole Erickson||Marcus Chait||Senator Kiley's Chief of Staff. Was originally assumed to be the one making anonymous phone calls to NCIS but it was actually Senator Kiley himself. He later took his own life by putting a plastic bag over his head but Gibbs later revealed that it was the Kileys had actually killed him and then disguised his death as a suicide.|
|Admiral Charles Graves, USN||William Bumiller||Lt. Commander McLellan's C.O.|
|Reed Talbot||Bill Sage||Lobbyist attempting to defeat Senator Kiley's energy bill. Ziva later went undercover and got his signature while also obtaining DNA from a pen he used.|
|Tiffany (Capitol Offense)||Sara Sanderson||Cyclist who found Lt. Commander McLellan's body.|
|David||Jeffrey G. Barnett||Cyclist who along with Tifffany who discovered Carrie McLellan's body in a swamp.|
|Lt. Commander Carrie McLellan, USN||Debra Arnott||Murder victim who had been having an affair with Senator Patrick Kiley. Uncredited role.|