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LEONARDTOWN, Md. (WUSA9) -- St. Mary's County officials are investigating the death of a 34-year-old male Tuesday morning.

Officials say the man was found dead in a Leonardtown, Md. residence, and it's believed that he had consumed a controlled substance prior to his death.

The deceased subject was a witness to a fatal overdose on Monday night, officials say.

The decedent was transported to the Baltimore Medical Examiner's Office and the cause of death is pending.

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