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Regis Philbin has been working in television for half a century. He's been co-hosting his current weekday talk show for 23 years.

His last day of hosting Live with Regis & Kelly is Friday (9 a.m., Ch. 13). But first, he's profiled in Thursday's special edition of 20/20 (7 p.m., ABC.Ch. 4).

Katie Couric spends time with Reege; he talks about his life and career; it's all very nostalgic.

Philbin is an original. His career is remarkable. He deserves all the fond farewells he gets.

Elsewhere on TV ...

The Big Bang Theory (7 p.m., CBS/Ch. 2): Comic book store-owner Stuart asks Amy out on a date.

Community (7 p.m., NBC/Ch. 5): The study group is asked to star in a commercial for the college.

The X Factor (7 p.m., Fox/Ch. 13): Another hopeful is voted out.

Women's college volleyball (7 p.m., BYUtv): Gonzaga at BYU

Parks and Recreation (7:30 p.m., NBC/Ch. 5): Leslie uses her new tourist attraction to spend more time with Ben.

Person of Interest (8 p.m., CBS/Ch. 2): The latest person of interest has connections to Cold War Soviet espionage circles.

The Office (8 p.m., NBC/Ch. 5): Andy tries to motivate the team by taking them to Gettysburg.

Private Practice (8 and 9 p.m., ABC/Ch. 4): In back-to-back episodes, the doctors stage an intervention for Amelia; Addison collapses during fertility treatments.

Bones (8 p.m., Fox/Ch. 13): The remains of a murdered toy-company executive are found packaged with a Prince Charming doll.

Whitney (8:30 p.m., NBC/Ch. 5): Whitney and Alex decide to adopt a dog.

The Mentalist (9 p.m., CBS/Ch. 2): The team looks for a cop killer.

Prime Suspect (9 p.m., NBC/Ch. 5): A young girl's parents are murdered.

It's Always Sunny in Philadelphia (11 p.m., FX): Mac tells a priest that he got fat because of his friends.

Burn Notice (11 p.m., USA): Michael leads a CIA rescue mission.