The actress who voiced Mrs Krabappel died last month .
In last night's U.S. episode of The Simpsons, this happened on the opening credits.
Bart paid a sombre tribute to his former teacher and sparring partner on the chalkboard sequence. Voice artist Marcia Wallace died on October 25.
Fox
Before the episode, Four Regrettings And A Funeral, Fox aired 1992 classic Bart The Lover, for which Wallace won an Emmy.
Fox
Fred Prouser / Reuters
Fox
