I think the death knell for cassettes was when the big auto-makers stopped putting cassette players in vehicles.
I have a '99 ford that was built with a cassette player. CD's became available in '82. I think that CD's were already the death of cassette tape, but cassettes actually enjoyed a bit of extra longevity due to the fact that it took manufacturers a while to develop a cd player that would work reliably in the jostling environment of an automobile. Tobiah To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html