OAKLAND, CA. (THECOUNT) — Emma Louis-Dreyfus, the half-sister of Seinfeld star Julia Louis-Dreyfus, has died of a seizure following a drug overdose.

Louis-Dreyfus, 44, died from a combination of cocaine and alcohol, on August 13 at a campsite close to a popular hiking trail in South Yuba River State Park, on Pleasant Valley Road, in Penn Valley, California.

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The cause of death of 44-year-old who lived in Oakland, California, was cocaine and ethanol intoxication. Her death was ruled accidental by the Nevada County Coroner’s Office last month. source

Louis-Dreyfus, who shares her billionaire father William Louis-Dreyfus with Julia, did not leave behind a will at the time of her death and had an estate worth $23 million.