In a crossover with Diagnosis: Murder, it's revealed that Matlock lost his life savings on bad investment advice from Dr. Mark Sloan. What was the product?

Andy Griffith's final TV appearance as Matlock was on the spinoff, Diagnosis: Murder. It was here that we discover why Matlock has been so thrifty all these years, despite making $100,000 per case: Dr. Mark Sloan had advised him poorly to invest his life savings in the 8-track tape industry. Needless to say, he lost all his money.

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