I have no idea if there is any truth in the rumors, but I'm trying to find any sort of source. Tell me if you find anything.
First source I've found... Obviously from TMZ: http://www.tmz.com/2009/12/20/brittany-murphy-dies-cardiac-arrest/
Sad if true, but I always wondered about her health. She lost A LOT of weight since she was on Clueless.
NY Daily News picked up on it but is only quoting TMZ.. Atlanta Journal Constitution had a story up but seems to have taken it down pretty quickly. And 123 guests viewing this thread? Awesome.
It was also up on AJC.com but they took it down... http://www.ajc.com/news/report-actress-brittany-murphy-248883.html Perhaps it's all rumors? New York Post The Sun MSN