8:59 AM PT -- The Broward County Coroner has now confirmed Samman passed away at 7:20 AM on Wednesday.
As for cause of death, the coroner told us, "It would be hard to suggest anything other than drugs" based on the conditions in which Samman and Kirkingburg were found.
An autopsy is scheduled -- but there could be delays due to the hurricane in the region. UFC middleweight Josh Samman -- who appeared on "The Ultimate Fighter" -- has died after spending several days in a coma ... this according to his 'Ultimate Fighter' castmate Gilbert Jamal Smith.
Samman was found unresponsive early Friday morning at an apartment in South Florida. His roommate, Troy Kirkingburg -- an MMA announcer -- was pronounced dead at the scene.
It's unclear how the two men died.
There were rumblings that heroin played a role -- but Samman's mother came out and said doctors found no traces of the drug in his system. There were also no signs of foul play according to reports.
Samman was 28.