Burden of Proof is the 7th episode of NCIS Season 15 and also the 337th episode of the entire NCIS series.
After a convicted felon swears the NCIS agency framed him for murder a decade ago, Gibbs begins his own investigation, starting with a new autopsy by Ducky while Fornell joins the team since he was the lead investigator in the original joint FBI and NCIS case.
- As a result of Gibbs' testimony at Gabriel Hicks retrial, Fornell is fired from the FBI.
|Leroy Jethro Gibbs||Mark Harmon||Special Agent in charge of the NCIS Major Case Response Team.|
|Abigail Sciuto||Pauley Perrette||Chief Forensic Specialist for the NCIS Major Case Response Team.|
|Timothy McGee||Sean Murray||Senior Special Agent and second-in command of the NCIS Major Case Response Team.|
|Nicholas Torres||Wilmer Valderrama||Special Agent for the NCIS Major Case Response Team.|
|Eleanor Bishop||Emily Wickersham||Special Agent 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.|
|Jacqueline "Jack" Sloane||Maria Bello||NCIS Special Agent.|
|Donald Mallard||David McCallum||Chief Medical Examiner for the NCIS Major Case Response Team.|
|Clayton Reeves||Duane Henry||Interagency Liaison between MI6 and NCIS. Despite being credited, Henry does not appear in this episode.|
|Tobias Fornell||Joe Spano||Senior FBI Agent.|
|Gabriel Hicks||Graham Hamilton||Claiming to be innocent man for murder, after 10 years of imprisonment, serial murder is set free after trial.|
|Jessica Shaeffer||Hilary Ward|
|Mary Elaine Smith||Fran Bennett|
|Edward O'Connell||Brian Maierhofer||Navy Lieutenant.|
|Raymond Smith||Allen Maldonado||Nephew of "Witness X", Mary Elaine Smith.|
|Denny Rydell||Beau Billingslea||AKA "Pop".|
|Thomas Gardiner||Todd Jeffries|
|Susan Delphy||Penny Peyser||Judge.|