When was the slogan "living color" dropped from the networks?

[frenchy]

Now I'm thinking it was Letterman, on the Late Night on NBC, Dave would have an RCA or GE tv (whoever owned NBC at the time!) with the new stereo onstage and used it as a prize for audience members or something like that, in a humorous way of course. Wow that must have been what, about 1986? I remember first show I heard in stereo was Miami Vice when the family bought our first stereo tv, a Mitsubishi, was very cool indeed with the soundtrack on that show.....Frenchy