Once a Crook is the fifth episode of NCIS Season 11 and the 239th episode of the entire NCIS series.
As the team investigate the murder of a Petty Officer, Tony who's suffering from sleep deprivation that has been triggered as a result of Ziva's abrupt and permanent departure from the NCIS team soon realizes that the main suspect in the case involving the murder of a Petty Officer could be connected to a fifteen year old case that he investigated while working as a cop for the Baltimore Police Department.
In a forest that's shrouded in mist, Petty Officer First Class Andrew Wells runs out of a small area before stumbling with Wells soon losing his balance and falling.
Wells glances around, panting, the running obviously taking its toll on him.
He then gets up and starts running again.
As he does that, Wells runs past a lake and crawls through some bushes before eventually reaching a lone road.
He then stops upon seeing a car there, its engine on.
Seeing a chance, Wells runs forward.
In the car, Martha states that he lives there.
"Well", her husband, George says.
Martha tells him he's acting like a child.
He tells her "Martha, please" and that if she cares about him at all, she'll let him figure it out on his own.
Meanwhile, Wells edges closer.
As that happens, a man emerges from the bushes and shoots Wells in the back.
As opera continues playing in the car, Martha, unaware of what's just happened tells her husband to just drive with her husband thanking her.
Seconds later, they drive off.
It then cuts to show Wells lying on the stretch of road, dead, the bullet wound in his back still visible.
In Interrogation, Gibbs reveals to Spoke that two nights ago, Petty Officer Wells was attacked at Marie Markin's house.
- It's revealed that DiNozzo has been battling insomnia for at least half a week.
|Leroy Jethro Gibbs||Mark Harmon||Special Agent in charge of the NCIS Major Case Response Team.|
|Anthony DiNozzo Junior||Michael Weatherly||Senior Special Agent and second-in-command of the NCIS Major Case Response Team.|
|Timothy McGee||Sean Murray (actor)||Special Agent for the the NCIS Major Case Response Team.|
|Abigail Sciuto||Pauley Perrette||Chief Forensic Specialist for the NCIS Major Case Response Team.|
|James Palmer||Brian Dietzen||Assistant Medical Examiner for the NCIS Major Case Response Team.|
|Leon Vance||Rocky Carroll||Director of NCIS. Does not appear in this episode.|
|Donald Mallard||David McCallum||Chief Medical Examiner for the NCIS Major Case Response Team.|
|Delilah Fielding||Margo Harshman||Department of Defense Employee and McGee's girlfriend.|
|George (Once a Crook)||Andrew Friedman||A man who is Martha's husband.|
|Martha||Sherri Parker Lee||A woman who is George's wife.|
|Anton Markin||Augustus Prew||A man who is also Marie Markin's brother.|
|Marie Markin||Susan Spano||A woman who is also Anton Markin's sister.|
|Jake Spoke||Mac Brandt||A man who appears in the episode.|
|Milo Rankoff||Patrick Mulvey||The killer.|
|Amy Linden||Samantha Quan||A woman who appears in the episode.|
|Andrew Wells||Wes McGee||Petty Officer First Class in the United States Navy and also the murder victim.|