New details have emerged in the death of former Alaskan Bush People star Matt Brown, with an autopsy report officially confirming how the reality TV personality died after he was recovered from a Washington state river last month. According to an autopsy conducted by the Okanogan County Coroner and obtained by Page Six , Brown's death was ruled a suicide. The report determined that the 43-year-old died from a single gunshot wound to the head. The coroner also noted contributing factors, including immersion in water after the injury and the presence of methamphetamine in his system at the time of his death. Officials have since authorized the release of Brown's body to his family for funeral arrangements. The findings bring a definitive answer to a story that unfolded publicly over several days and left family members fearing the worst.…