The phrase "assassination episode" is correct and usable in written English.
It can be used to refer to a specific event or incident involving an assassination, often in a narrative or analytical context.
Example: "The documentary explored the assassination episode that changed the course of history in the region."
Alternatives: "assassination event" or "assassination incident".
Or compare this episode with the stunning Kennedy assassination episode.
The King assassination episode devolved into a "We Didn't Start the Fire" grab bag of references to everything from Karl Marx to the Second Avenue subway, the gentrification of the Upper West and Upper East Sides, Paul Newman, Tecumseh, Eugene McCarthy and "Planet of the Apes".
UPDATE: As Billie reminded me in the comments, "Mad Men" deserves to be in this one, too (don't know how I forgot it, as it's one of my favorites); the JFK assassination episode alone making it remarkable.
The Cold War and Kennedy assassination episodes are by contrast excellent — involving, enlightening, crisply immediate.
PBS's commemoration of the 50th anniversary of Kennedy's assassination continues on episodes of "Nova" and "Secrets of the Dead" on Nov. 13.
The upswing began on Nov. 29, when "Scandal" introduced a presidential assassination plot in an episode that drew 6.6 million total viewers.
That's why it is difficult for the world to write off Hariri's assassination as just another episode in Lebanon's fratricidal history.
For Juan Gabriel Vásquez, among the most inventive and erudite of Colombia's emerging generation of novelists, the assassination was the "defining episode of our history – our own JFK".
"The momentum of word of mouth is what finally lit the fire," said Mr. Sorkin, who said he had planned the final episode's assassination attempt from the start of the series.
All of which is to say that most of last night's The Assassination of Gianni Versace episode, "House by the Lake," was invented by writer Tom Rob Smith.
In this episode, the assassination of a chess grandmaster leads Mulder and Scully into an investigation that they soon discover strikes at the heart of the X-Files; they learn that the real target was a telepathic boy named Gibson Praise.
