We told the story of Richard Thompson, the cartoonist behind the fey and subversive comic strip “Cul de Sac,” back in April, describing his battle with Parkinson’s, and his plans to keep producing the daily cartoon even as the disease progressed. Unfortunately, Thompson says he cannot keep up with the demanding schedule, even using a colleague to handle inking his roughs. The strip’s last installment is September 23. Thompson’s inker, the cartoonist Stacy Curtis, wrote a tribute as well. Thompson has a gift of combining satire, the blurred memories of childhood, and a delight in life that I’ll miss in his strip. I hope at whatever pace he is able, we continue to see new work from him.