David Miller and Hannah Witheridge
David Miller and Hannah Witheridge were found dead in ThailandFacebook

The man found dead on a beach on the Thai island of Koh Tao has been named as 24-year-old David Miller. His companion was Hannah Witheridge, 23, from Great Yarmouth, according to The Sun.

Police launched a double-murder inquiry after two naked people with horrific head wounds were found beaten to death on a beach on Monday at 11am local time.

Investigators found a bloodied hoe nearby, which they believe caused the pair's "gruesome" head injuries.

Miller, from Jersey in the Channel Islands, appears to have been travelling across Asia and Australia before he made his way to popular tourist destination Koh Tao.

Photos on his page show Miller painting party-goers' bodies in preparation for a Full Moon party days before he was reportedly killed.

Colonel Prachum Ruangthong said the victims' bodies were found naked on a rocky beach, with the woman reportedly wearing just a bikini top and their clothes blood-stained.

According to local reports, the woman had been raped in an attempted robbery.

Prachum said police are studying CCTV footage from nearby restaurants, hotels and shops for clues. Reports said the island's ferry dock had been closed to prevent potential culprits fleeing the island.

A Foreign Office spokesman said: "We are aware of the death of two British nationals on September 15 on the island of Koh Tao in the Gulf of Thailand.

"The Embassy are urgently seeking information from the local authorities and stand ready to provide consular assistance as needed."