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David Letterman's last night at CBS isn't for another couple of weeks, but this is a big day for the longtime talk-show host.

In prime time, Ray Romano hosts "David Letterman: A Life on Television" (8:30 p.m., CBS/Ch. 2) — a 90-minute retrospective.

And then on the "Late Show" (10:35 p.m., CBS/Ch. 2), President Barack Obama is Dave's guest.

And, by the way, if you haven't been watching Letterman's last few weeks of shows, you've been missing out. He's been on top of his game, and the shows have been great.

Elsewhere on TV ...

"Two Broke Girls" (7 p.m., CBS/Ch. 2): Max and Caroline's attempt to break Nash into the modeling business comes to a screeching halt when his mother arrives from Ireland.

"Dancing With the Stars" (7 p.m., ABC/Ch. 4): The remaining contestants perform.

"The Voice" (7 p.m., NBC/Ch. 5): The top six perform.

"Gotham" (7 p.m., Fox/Ch. 13): As Gotham City's gang war reaches its boiling point, Fish Mooney goes head-to-head with Maroni and Penguin. Phil and Carol reconcile their differences. (Season finale. The show has been renewed for another season.)

"The Originals" (7 p.m., CW/Ch. 30): Klaus discovers he's been betrayed by his own siblings.

"Mike & Molly" (7:30 p.m., CBS/Ch. 2): Molly gets angry at Mike for not listening to her vent about writing with Peggy.

"The Following" (8 p.m., Fox/Ch. 13): The investigation leads the team to a dangerous serial killer linked to Theo.

"Jane the Virgin" (8 p.m., CW/Ch. 30): Jane is nervous about attending her five-year high school reunion because she feels her life is not what she expected it to be.

"Castle" (9 p.m., ABC/Ch. 4): The producer of a sketch-comedy show is murdered.

"The Night Shift" (9 p.m., NBC/Ch. 5): Odd cases abound during a full moon. Which was also the plot of an old episode of "ER."

"Bates Motel" (10 p.m., A&E): Norman spends the day with a surprising visitor.

"The Returned" (11 p.m., A&E): Peter makes a startling announcement; Helen sets her deadly plan in motion.