A fourth man has been arrested by Mauritian police investigating the murder of Michaela Harte McAreavey.
He is a member of the security staff at the four-star Legends Hotel, police on the island confirmed.
On Monday, around 3,000 people attended the funeral of the Irish language teacher, 27, who was strangled a week ago on her honeymoon.
A spokesman for police in Mauritius confirmed a further person is in custody in connection with the murder.
He told the BBC: "He is one of the persons who was engaged in security work."
Three men, all staff at the luxury hotel, have been charged in connection with the killing, thought to have happened as newlywed Mrs McAreavey disturbed a burglary in her room.
Room attendant Avinash Treebhoowoon, 29, and floor superviser Sandip Moneea, 41, have been charged with murder, and room attendant Raj Theekoy, 33, with conspiracy to murder.
They are due to appear in court on Wednesday.
Mrs McAreavey, from near Ballygawley, Co Tyrone, was the daughter of Tyrone GAA (Gaelic Athletic Association) manager Mickey Harte.
On Monday her father and husband John carried her coffin as the crowd walked in silence to the church where she was married last month. She was buried in her wedding dress.