AMERICAN HORROR STORY: COVEN-- The youngest members of the Coven come together to speak to a dark spirit that lives in the house with them. (Michele K. Short/FX)

A heroic attempt goes wrong on this week’s “Arrow” (CW at 8 p.m.). Diggle follows Deadshot in Russia in an effort to rescue a missing Lyla, but when Isabel insists on tagging along with Diggle, Oliver and Felicity, things get messy.

The 1963 assassination of President John F. Kennedy is reinvestigated on the special, “NOVA: Cold Case JFK” (PBS at 9). Using contemporary scientific techniques, NOVA asks: Could modern investigators do better? For the first time since the original investigation by the FBI laboratory, NOVA and a team of foremost forensic experts employ sophisticated new technology to reconstruct and review the physical evidence: the weapon, the bullets and the wounds.

Gloria volunteers Jay to be part of security for the school fair on “Modern Family” (ABC at 9), but he’s paired with his nemesis, which makes for some serious tension. Meanwhile, Phil plans a 20th-anniversary surprise for Claire at the same time she has one waiting for him at home.

Teenagers who were once reported missing are now committing a series of murders on “Criminal Minds” (CBS at 9). Meanwhile, Morgan has trouble dealing with his girlfriend’s new career aspirations.

George Clooney narrates the special, “Secrets of the Dead — JFK: One PM Central Standard Time” (PBS at 10) which recalls how the JFK assassination was reported by journalists on the scene in Dallas to Walter Cronkite, who anchored the coverage from New York. Dan Rather, Bob Schieffer, Marvin Kalb, Marianne Means and former president Bill Clinton all recall their experiences watching the news unfold.

Maddie looks for a newfound connection with Deacon as Teddy’s wedding day approaches on “Nashville” (ABC at 10). Rayna and Luke find themselves bonding as they discuss exes and children, and Juliette enrages a prominent DJ who then retaliates by promoting Layla.

Zoe, Queenie and Nan discover a dark spirit that dwells within the school and attempt to contact it on the newest “American Horror Story: Coven” (FX at 10). Cordelia faces the consequences of her fertility ritual that didn’t go quite as planned.

Actor Samuel L. Jackson and TV host Chris Matthews visit “Late Show With David Letterman” (CBS at 11:35).

Comedian Bill Cosby and actor Chris Pratt come to “The Tonight Show With Jay Leno” (NBC at 11:35), with musical guest Gary Allan.

Comedian Ray Romano and actor Eddie Cibrian are on “Jimmy Kimmel Live” (ABC at 11:35), with a musical performance from the Killers.

— Rachel Lubitz