The actor, 31, died in January, although few details were revealed about how.
But according to his death certificate, seen by TMZ, the actor died of a gunshot wound to the head, although the coroner is yet to establish whether his death was accidental or suicide.
The autopsy report was released on Monday by Henry County, Georgia. In it, examining doctor Rachel Geller reportedly wrote: “At the time this report is issued, the information available does not establish suicidal intent.
“If more information becomes available, this case may be revisited.”
Moseley was known for playing a pet zombie on the hit US show. Following news of his death, tributes were paid online by fans and the official The Walking Dead account.
“Moses was a phenomenal actor … but MUCH more than that, he was an AMAZING person!” said Avery Sisters Entertainment, the company that creates The Walking Dead.
“For those who knew him, he was the kindest, sweetest, most generous person you would ever meet. We will miss you dearly! Rest in Heaven!”
The official The Walking Dead account tweeted: “Our thoughts and prayers are with our #TWDFamily member Moses J Moseley.”
Moseley played a pet walker belonging to Michonne, played by Danai Gurira, in the zombie apocalypse series.
Jeremy Palko, who appeared alongside him in the show as Andy, said he was “heartbroken” by the news.
“Just an absolute kind and wonderful human being. You will be missed my friend,” he wrote.
Moseley, who was born in Aiken, South Carolina, also appeared in series including Queen of the South and American Soul.
He also made appearances on HBO’s Watchmen and the 2013 film The Hunger Games: Catching Fire.