No one murdered Gary Coleman ... this according to investigators who finally closed the case into the actor's untimely demise.
The decision to shut down the investigation comes just weeks after cops in Utah received and reviewed Coleman's autopsy report -- in which the coroner labeled Gary's death an "accident."
Indeed the autopsy concludes Coleman was in terrible shape before he died. A rep for the Santaquin Police tells us, "[Gary] was an accident waiting to happen. The last time I saw him he literally looked gray.”
FYI -- no one was ever suspected of killing Gary ... but his kinda-sorta wife Shannon Price did release an unsolicited statement denying any involvement in Coleman's death.