Aung Naing was gunned down as he tried to flee detention in Kyaikmaraw town in southeastern Mon state on October 4, the interim Myanmar Press Council (MPC) said citing a rare statement issued by the military.
He "tried to escape by fighting with a soldier and attempting to steal his weapon" said the document seen by AFP, adding that Aung Naing was suspected of being a member of a local armed group.
The US-based Committee to Protect Journalists (CPJ) said Aung Naing was thought to have worked for several local news titles but the MPC was unable to confirm his status as a reporter.
The military statement issued Thursday - a first of its kind from the army which ruled Myanmar with an iron fist for decades - added the man had been buried in Shwe Wah Chaung village, near where he died.
"This is a big question to ask the military, because they cannot show the dead body," he said, also questioning why the group had received news of the death nearly three weeks after the shooting.
Yesterday, the CPJ said the death of Aung Naing was "reprehensible", adding that he was the first reporter killed in the former junta-run nation since 2007.
"Civilian authorities must investigate the military's accounting of his death, which has the initial hallmarks of a cover-up," said Shawn Crispin, CPJ's Southeast Asia representative, in a statement.
Reporters were regularly detained under the junta, which meted out long jail sentences to journalists while choking off information with some of the world's most draconian censorship rules.
Reforms implemented by the current regime, including freeing most political prisoners and lifting pre-publication press scrutiny, have been lauded by the international community as the country opens up.
