Carrie Fisher's death certificate confirms heart attack

LOS ANGELES -- Carrie Fisher’s death certificate confirms that the actress died of a heart attack, but it says more investigation is needed to try to determine the underlying cause.The Los Angeles County Department of Public Health issued the death certificate in the name of Carrie Frances Fisher. It was obtained Monday by The Associated Press.Under “cause of death” it says “cardiac arrest/deferred.” The “deferred” designation indicates that more investi