He was the only U.S. soldier convicted for his role in the Vietnam War atrocity in which U.S. troops killed hundreds of Vietnamese civilians.
The Naval Criminal Investigative Service is investigating retired Maj. Gen. William Mullen's cause of death.
Retired Adm. Robert Burke was indicted last month.
A trial began this week for an Army vet accused of obtaining more than $767,000 in VA benefits by falsely claiming he was paraplegic.
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