Brittany Murphy

Brittany Anne Murphy-Monjack (November 10, 1977 – December 20, 2009) was a voice actress on King of the Hill portraying Luanne Platter and Joseph Gribble before he went through puberty.

Trivia

Both she and Reese Witherspoon previously collaborated in the 1996 exploitation movie Freeway before they voiced in Hanky Panky and High Anxiety.
In 2005, Murphy won an Annie Award (Voice Acting in an Animated Television Production) for voicing Luanne in the episode "Girl, You'll Be a Giant Soon".
On December 20, 2009, Murphy died of pneumonia and anaemia at the age of 32. Her death came roughly three months after the conclusion of ''King of the Hill''on FOX.
Murphy was 19 years old when she started voicing Luanne Platter.