In October of 1988, actress Denise Huxtable (played by Lisa Bonet) was removed from the cast of NBC's A Different World. The reasons for her removal are not entirely clear, but there are a few possible explanations.
One reason may have been that Bonet was pregnant at the time and the producers did not want to write her pregnancy into the show. Another possibility is that Bonet wanted to pursue other projects and was not interested in continuing with A Different World. Whatever the case, her departure meant that her character, Denise Huxtable, had to be written off the show as well.
A Different World continued without Denise Huxtable for its final two seasons, airing its series finale in 1993.