An Anglesey mother has vowed to continue to try and find out how her son died in Thailand six years ago.
An open verdict on Peter Sinnott. Photo: Daily Post
Speaking after an inquest at Llangefni recorded an open verdict on Peter Sinnott, Bobbie Sinnott said she was convinced her son had been murdered.
Mr Sinnott, 39, was found in the sea off the popular holiday resort of Pattaya on 5 January, 2002.
The family say they have already spent £30,000 in their bid to discover what led to Mr Sinnott's death.
The inquest heard he was tested for alcohol and drugs but none were found.
Hours before he drowned he cashed travellers cheques worth 300 US dollars (£152).
Speaking outside the court after the open verdict Mrs Sinnott said: " We have waited a long time for this and I am obviously unhappy it wasn't an unlawful killing verdict.
"Having said that, we will carry on trying to find out the truth of it."
Her daughter Judith Sinnott, 39, who gave evidence at the inquest added: " We will continue to investigate and never give up - we won't stop until the truth prevails."
Mr Sinnott, who grew up in Holyhead, had lived in Durban, South Africa, for 14 years.
The inquest heard that despite calls to the Thai police and the British Embassy about his disappearance, the authorities assured the family they had checked prisons, hospitals and morgues for anyone matching his description.
It was a private detective hired by the family who located his body four months later in a Bangkok mortuary.
Mrs Sinnott claimed Thai police failed to launch a proper investigation, believing Mr Sinnott was drunk and fell to his death.
She said Thai police eventually admitted her son, who had no history of depression and was in good health, may have been robbed.
"I have no doubt he was killed by another person," she said.
North west Wales coroner Dewi Pritchard Jones said because Mr Sinnott's body had only minor injuries, such as scratches and bruises to the hand, there was insufficient evidence to record an unlawful killing verdict.
"It is unsatisfactory and doesn't provide answers, but the evidence doesn't provide answers," he said.
The official cause of death was recorded as drowning.