One of the many celebrity voices you hear on "The Simpsons" each week is commediene Marcia Wallace, as Bart's teacher, Mrs. Edna Krabappel. As Marcia Wallace died recently, the show paid a special tribute to her last night.

According to huffingtonpost.com:

"The Simpsons" had a very sweet tribute to actress Marcia Wallace during its opening credits. The classic chalkboard sequence had Bart Simpsons writing one sentence -- and it wasn't repeated. "We'll really miss you Mrs. K," he'd written. Wallace was the voice behind Bart's teacher, Edna Krabappel.

Wallace, who was also known for known as receptionist Carol Kester on "The Bob Newhart Show," passed away last week at the age of 70 of complications from pneumonia."