The autopsy for Demartravion "Trey" Reed -- a black student found hanging from a tree this week at Delta State University -- has been completed ... and officials have determined his manner of death was suicide.

The Cleveland Police Department announced an autopsy performed by the Mississippi State Medical Examiner's Office was "consistent with the initial investigation, determining the cause of death to be hanging and the manner of death as suicide." Play video content

Final toxicology results are still pending, and can take between 2 and 4 weeks, police noted. They also said "all files and investigative material" have been sent to the FBI and the U.S. Attorney's Office for further review.

As we reported ... the 21-year-old student was found hanging from a tree on campus Monday,

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