NCIS, Season 10

[examining the body of Eli's assassin]

Ducky:
Suicide by cyanide. A three-word nursery rhyme, and a popular means of escape throughout history, for cowards. Goring, Himmler, Goebbels. Still no identification?

Gibbs:
McGee's not having much luck.

Ducky:
Maybe medical records could help, as it seems that cyanide was only expediting the inevitable.

[Ducky rolls a surgical tray with a diseased organ towards Gibbs.]

Gibbs:
What's that?

Ducky:
His liver, riddled with inoperable tumors. Doesn't appear to be under treatment. I'd have given him six months.

Gibbs:
Made killing himself easier?

Ducky:
[his tone iron hard] Pity does not validate cowardice.