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In page Rachel Roberts (actress):

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On 26 November 1980, Roberts died at her home in Los Angeles at the age of 53. Her cause of death was initially attributed to a heart attack.[3] Her gardener found her body on her kitchen floor, lying amidst shards of glass; she had fallen through a decorative glass divide between two rooms.[4] An autopsy later determined that her death was a result of swallowing lye, alkali, or another unidentified caustic substance, as well as barbiturates and alcohol, as detailed in her posthumously published journals. The corrosive effect of the poisonous agent was an immediate cause of death. The coroner documented the cause of death as "swallowing a caustic substance" and, later, "acute barbiturate intoxication."[4][5] Her death was ruled a suicide.[5]