Police in Brazil say the Greek ambassador to the country was killed by a local police officer who was having an affair with the envoy’s wife.
The officer had confessed to stabbing him to death, investigators said.
The ambassador’s Brazilian wife Francoise Amiridis has been detained along with the officer and his cousin.
They are being questioned at a police station.
Ambassador Kyriakos Amiridis, 59, was last seen Monday evening leaving the home of friends of his Brazilian wife in a poor and violent suburb of Rio’s metropolitan area, police had said earlier on Thursday.
A Rio state police official said the ambassador’s wife reported him as missing on Wednesday.
Globo showed images of the burned-out white car in the Nova Iguacu neighbourhood where the ambassador went missing. The station reported that the licence plates on the car matched those of Amiridis’ rental vehicle.
Rio police inspector Evaristo Pontes had earlier told the Folha de S.Paulo newspaper that he did not believe the ambassador was kidnapped.
Mr Amiridis previously served as Greece’s consul general in Rio from 2001 to 2004.
More recently he was Greece’s ambassador to Libya from 2012 until he took the top Brazil post at the beginning of 2016.