Mr Kerry had been visiting Turkey with his girlfriend Molly, his grandparents and other relatives.

It was Mr Kerry’s first family holiday abroad, but he died within 36 hours of arriving.

They had been having a drink at the bar in a hotel called the Trendy Lara in the early hours of 29 November when Mr Kerry, who had fallen asleep on a sofa, vanished.

Mr Kerry, an office fitter, was found at the bottom of the lift shaft in the hotel basement.

Paramedics were called but he was pronounced dead at the scene.

Turkish police said Mr Kerry had been under the influence of alcohol and fell from the first floor, but Mr Kerry’s brother has claimed he was murdered.

The lift had been out of use, according to police, and there was “no proof of firearm or sharp object injuries”.

Mr Kerry’s grandmother, Collette Kerry, said she was “absolutely disgusted” by the police’s response and the handling of the investigation.

A final autopsy result from the Turkish authorities is expected in a few weeks’ time.

A spokesperson for the hotel said staff had been supporting the family, but said they were unable to comment further because of the police investigation.

The BBC has approached the Turkish police for further comment.