Matt Brown—one of the stars of the reality series Alaskan Bush People —is feared dead, according to his own family.  On Thursday, Matt’s brother Bear took to his TikTok page to share some “really bad news about Matt,” before adding that he couldn’t confirm it 100% at the time of posting. He later claimed that witnesses allegedly saw his brother take his own life, before seeing a body “floating in a river.” The local Okanogan County Sheriff’s Office confirmed in a Facebook post that a man called 911 after speaking with “a male sitting in the shallow water of the Okanogan River,” south of Oroville, Washington, on Wednesday. The caller said he then “turned away from the man sitting in the river, heard a sound, turned back toward the man in the water, and saw the man face down in the water drifting away in the current.” Police, firefighters, and EMS personnel all responded to the scene, but, as of Friday morning, no body has been located.…