John Kirby Gender:   Male Portrayed by: Wilson Bethel  First Appearance   ●   NCIS: Switch  Last Appearance   ●   NCIS: Switch List of Appearances

John Kirby was a Petty Officer who served alongside the deceased Petty Officer Jerry Smith and even posed as him at some point until NCIS finally discovered his true identity.

He was originally suspected of having murdered Petty Officer Smith but was later found innocent.

Despite this, Kirby was convicted of impersonating a petty officer, lying during a federal investigation, and resisting arrest and it's presumed that he was jailed for those crimes against him.