A tuxedo-wearing amateur marksman has been arrested over the alleged road rage murder of a British pensioner in Thailand.

Property developer Apicha Boonsawat, 32, was detained on Saturday morning after Neil Roger, 70, was blasted four times killing him instantly as he rode his scooter home from the pub.

Locals called paramedics who performed CPR but were unable to revive the retired civil engineer from Doncaster, West Yorkshire, on Thursday night. He is bled to death on the road.

Neil's devastated girlfriend Thitipan Kamlas, 38, broke down in tears by Neil's dead body as officers began investigating in Pattaya, around 90 miles from the capital Bangkok.

They finally traced the white Honda Jazz seen on CCTV to the home of Apicha, a gun fanatic who attended nearby shooting clubs and had a collection of deadly weapons which he had used in marksman competitions.

A SWAT team of 50 elite commandos surrounded the suspect's home but he had already fled following the shooting.

However, the shooter, who studied at King's High School in Dunedin, New Zealand, turned himself in this morning while carrying the same 9mm Glock G19 he had allegedly shot Neil with.

He wore a navy blue bucket hat and light blue sweater.

Speaking in the video, Apicha said: 'I would like to say sorry to the public. I had never met him before. It started at the junction. The foreigner hit the horns and started banging on my car. I caught up with him towards the forest area and I stopped the vehicle.'

Officers said that road rage was the motive for the killing after the two men clashed at a junction. The alleged shooter has been remanded in custody and the questioning is ongoing.

Police Colonel Surakit In-am from the Huay Yai district station said Apicha had admitted shooting Neil but claims he was provoked by him 'banging on his car'.

He said: 'The suspect's defense is that he was attacked first by the victim. He says that the victim behaved aggressively towards him by honking his horn and hitting his car.

'He is now being questioned about the charges of murder and possessing, carrying, and firing a gun without a reasonable cause.'