Antigua prosecutors have tried to link two defendants to a stolen mobile phone that belonged to a British couple shot dead on their honeymoon at a wealthy Caribbean resort.
An employee at a local mobile phone provider told a court in St John's that two SIM cards used in the couple's Nokia phone after the killings were identified by the telephone's unique identity number, known as an international mobile equipment identity.
Jurors also heard evidence suggesting the defendants were near the hotel around the time Welsh couple Catherine and Benjamin Mullany were shot dead in their holiday cottage in July 2008.
The Mullanys, both 31, Pontardawe, Swansea Valley, were attacked during an apparent robbery on the last day of their two-week honeymoon.
Mr Mullany was critically wounded in the attack and died a week after his wife after he had been taken back to the UK for treatment.
Avie Howell and Kaniel Martin have pleaded not guilty to murdering the Mullanys.
They are also accused of shooting Jamaican shopkeeper Waneta Anderson Walker during an alleged crime spree in July 2008.
They are also expected to face trial over two other deaths on the Caribbean island.
The Mullany murder trial is in its second week.