David Letterman Announces His Retirement From The Late Show

Patrick Creaven
The late night legend says his last show will be in 2015.

On of the greatest late night talk show hosts ever is calling it a career.

David Letterman announced his retirement on his CBS show Thursday, and plans to walk away from the gig in 2015.

The 66-year-old has hosted the "Late Show with David Letterman" for 21 years.