Nan, Queenie and Zoe come together to fight for their school’s future on "American Horror Story: Coven." (Michele K. Short/FX )

Live from Nashville, Brad Paisley and Carrie Underwood host the “47th Annual CMA Awards” (ABC at 8 p.m.). Expect an epic performance from Taylor Swift, collaborative efforts such as the Zac Brown Band jamming with Dave Grohl and more than a few surprise guests.

Oliver and Canary are attacked by a trained killer from the League of Assassins on “Arrow” (CW at 8). Moira is offered a choice of pleading guilty to murder and conspiracy, and thereby avoiding the death penalty, or taking her chances in court.

A series of strangulations in Boston are investigated on “Criminal Minds” (CBS at 9), and the probe reveals that the killer likes to keep mementos from his victims. Meanwhile, the gang rallies around Rossi while his favorite bar is on the verge of closing.

Following last week’s investigation, Fiona and Myrtle battle for control of the coven on “American Horror Story: Coven” (FX at 10). Marie Laveau continues her assault on the girls’ school while Zoe discovers a new power, and the students are forced to come together in support of their headmistress.

Greg Sanders is accused of framing a man for murder seven years ago on “CSI: Crime Scene Investigation” (CBS at 10). Elsewhere, an unidentified man is found during torrential rains, and the investigators have trouble gathering evidence.

The chefs are asked to create dishes with the elusive creole tomato on “Top Chef” (Bravo at 10). To avoid elimination, the contestants must impress the chefs at John Besh’s restaurant in a farm-to-table challenge.

SERIES PREMIERE: “Elder Skelter” (Investigation Discovery at 10) examines the shocking stories of senior citizens whose twilight years turned murderously dark. The series will investigate cases ranging from a granny twosome who kill for money to a couple who decide the best way to celebrate a golden anniversary is to end their marriage.

Actors Natalie Portman and Chris Elliott come to the “Late Show With David Letterman” (CBS at 11:35), along with musical guest James Blunt.

Comedian Ellen DeGeneres joins “The Tonight Show With Jay Leno” (NBC at 11:35), with music from Tired Pony.

TV host Phil McGraw and sportscaster Erin Andrews are on “Jimmy Kimmel Live” (ABC at 11:35), with a musical performance from Florida Georgia Line.

Rachel Lubitz