The US defence attache in Cyprus was found dead on Monday on a hilltop in a remote part of the Mediterranean island, four days after he went missing in mysterious circumstances.
US ambassador Ronald Schlicher confirmed the body of a man found in the foothills of the Troodos mountains southwest of Nicosia was defence attache Thomas Mooney, who was last seen on Thursday.
However, the US State Department said it did not believe terrorism was behind his death.
"After notification of next of kin, with deep sadness, I announce that Thomas Mooney, who served his nation with distinction as our defence attache, was found dead by Cypriot authorities on Monday," Schlicher said in a statement.
"The cause of his death is being investigated."
Police cordoned off the area west of the capital Nicosia following the discovery of the body but had released no information about the cause of death.
"I would not point you in the direction of an act of terrorism," State Department spokesman Sean McCormack said in Washington. "I don't think there is anything pointing in that direction."
State-run Cyprus Broadcasting Corporation radio however reported that investigators "seem to be ruling out foul play" after an initial forensic probe at the scene.
It also said the body appeared to have been there for some time.
Police told AFP that the body was found near Mooney's abandoned car, which showed no signs of damage and had been locked, according to reports.
The 45-year-old diplomat, who had the rank of lieutentant-colonel and was married with children, was last seen leaving the US embassy in Nicosia around midday on Thursday.
They have not said whether they are treating the death as suspicious or elaborated on the investigation, except to say it is considered "sensitive."
The embassy did not elaborate on the causes of death or give further details about the diplomat, who had been serving in Cyprus for more than a year on his second posting to the country.
Mooney reportedly said he was going to a hotel gym on the day he left the embassy, while another version had him going to the airport.
The US embassy issued a statement saying it had cancelled a July 4 celebration planned for Monday.
"In light of the circumstances regarding Mr Mooney the US embassy is cancelling this evening's Independence Day reception," the statement said.
Cyprus is not considered a dangerous posting for foreign diplomats.
US ambassador Rodger Davies was shot dead in August 1974 when Greek Cypriot demonstrators, angry at what they saw as US connivance in that year's Turkish invasion of northern Cyprus, attacked the embassy.
The last serious incident was in 1988, when a planned bombing of the Israeli embassy went awry. A explosives-laden car on the way to the embassy exploded nearby, killing the Lebanese driver and two Cypriot pedestrians.
Mystery surrounds death of US diplomat in Cyprus