Two SEAL Team 6 commandos are under investigation by the U.S. military for their possible involvement in the strangulation death of an Army Green Beret in June while they were on a secret assignment in Mali, The New York Times reported on Sunday. SEAL Team 6 was the famed counter-terrorism unit that carried out the raid that killed Osama bin Laden.

On June 4, Staff Sgt. Logan J. Melgar, 34, was found strangled to death in the American embassy’s housing unit in the capital city of Mali. Melgar’s mysterious death is listed as a homicide, according to The Washington Post.

Four American soldiers were killed in an ambush earlier this month in neighboring Niger while conducting a dangerous counter-terrorism mission against Islamic militants in the area. His was another violent murder of an American soldier to take place under unknown circumstances in that region of Africa.

A veteran who served two tours in Afghanistan, Melgar joined the Army in 2012 and was assigned to the 3rd Special Forces Group. Coincidentally, this was the same unit of soldiers that was attacked by Islamic militants in Niger on Oct. 4.

There have been no charges in his death, but the two members of SEAL Team 6 who were previously described as “witnesses” were flown out of Mali and placed on administrative leave, the Times reported. They are now considered to be “persons of interest.”

The possible involvement of the two SEALs has left the military community speculating about the possible motive for the death — was it a personal dispute? Or, was it something more sinister?

Melgar was reportedly in Mali on a mission to provide intelligence about ISIS militants to U.S. Ambassador Paul A. Folmsbee and protect the staff against possible attacks, it is reported.

Melgar will be buried at Arlington National Cemetery on Nov. 20.