Don Knotts may have been one of the busiest and most popular stars on TV in the 20th century, but all that fame does come with a price. © Getty Images Don Knotts rose to fame as a cast member on "The Andy Griffith Show"Why was Don Knotts' absent so much during his daughter's childhood years? That was especially true of his time appearing on The Andy Griffith Show from 1960 to 1965, which his daughter Karen recently recalled for Woman's World. Why did Don Knotts leave The Andy Griffith Show? © Getty Images "I was so excited to be on the set for this one that I couldn't stop smiling."