Adam Gilbertson, the Minnesota native found dead in Denver nearly a month after he disappeared, had multiple drugs in his system at the time of his death, according to a newly released autopsy report.

Gilbertson, 29, was found deceased nearly a month after he disappeared following a night out in Denver.

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The autopsy report released by the the Denver Office of the Medical Examiner Saturday says the registered nurse died from a toxic mix of drugs and alcohol in combination with a possible fresh water drowning.

Gilbertson never showed up for work on the morning of December 15. Surveillance video detailed Gilbertson’s whereabouts on the night of Thursday, December 14 through early Friday morning. Missing under strange circumstances, his family organized a search party with more than 100 volunteers back in January to search for the missing man. His body was eventually found on the afternoon of Jan. 13 along the eastern bank of the South Platte River. source

According to the autopsy report obtained by Denver7 from the Denver Office of the Medical Examiner, Gilbertson died “as a result of the combined toxic effects of alcohol, hydrocodone (an opioid pain-killer), and amphetamine in combination with possible fresh water drowning, with a significant contributing condition of recent cocaine use.”

Gilbertson’s manner death was ruled an accident.