I think it was the complete dearth of heart, soul, and taste that the 1980's wrought upon society that killed disco. Not any particular song or artist.
Disco never really died. If anything, it went back to the gay and ethnic scenes where it emerged and eventually became what we call House music & Garage today. A lot of the good 80s dance tracks were rebranded as R&B or Funk due to the mainstream Disco backlash, but the influences were definitely apparent. I already listed "Call Me" by Skyy as one example. Here are a few others that I loved growing up.
Howard Johnson's "So Fine" (1982) -
http://www.youtube.com/watch?v=wo28MJIVt98
One Way's "Cutie Pie" (1982) -
http://www.youtube.com/watch?v=ohn5j1tPAtc
Junior's "Mama Used To Say" (1982) -
http://www.youtube.com/watch?v=rwTTGnDcwoA
Evelyn Champagne King's "Love Come Down" (1982) -
http://www.youtube.com/watch?v=Dnh7YmXSviY
Tom Browne's "Funkin' For Jamaica" (1980) -
http://www.youtube.com/watch?v=uuUy2ShGLyo
Ironically, this is around the same time that Hip-Hop started to spread its influence in the same cities that were responsible for the first wave of Disco back in the early 70s. Even though the first commercially successful Hip-Hop record was based off a Disco tune, the backlash prompted early pioneers to venture more towards R&B/Funk. In some ways, that is also reflected in the tracks listed above which blurred the lines between all of these genres even more.