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sodium amytal, a barbituate derivative (also known as "truth serum"), was more commonly used as a sedative in the 1950's. However, substances for which it is contraindicated include alcohol, of which Walker was known to abuse preceding the time of his death. It was not disclosed whether Walker was intoxicated at the time of his death, although his psychiatrist claims sodium amytal had been administered previously in significantly higher dosages. The coroner concluded that it had accumulated in his body in toxic levels, leading to the fatal event at the considerably lower dose.