DENVER (AP) -- Authorities say the body of a missing Minnesota native has been found in Denver about a month after he was last seen.

The Denver Medical Examiner's Office on Sunday identified the man as 29-year-old Adam Gilbertson. His body was found in the North Platte River on Saturday by volunteers who were searching for him.

The cause of death is still under investigation.

Gilbertson, a registered nurse, did not show up for work on Dec. 15. His employers called his family, who initiated a search.

Family members said he was last seen at about 1 a.m. that day, leaving a bar about a quarter-mile from his apartment.

Gilbertson graduated from a nursing program in Wyoming in August.

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