Rarely have the show's actors opted for retirement, but such is the case for longtime voice actress Pamela Hayden, who brought to life beloved characters such as Milhouse Van Houten, Jimbo Jones ...

Pamela Hayden, who voiced Milhouse Van Houten and a slew of other characters, announced she is retiring from the show after 35 years. Sunday's episode marks her final performance on the FOX show.