Footage shows the British base jumper who died in Thailand performing a similar leap just days earlier - as his brother revealed the fatal mistake that caused the accident.

Nathy Odinson, 33, from Huntingdon, Cambridgeshire, is seen in the video jumping from a dangerously low apartment building in Pattaya. He was using the 'static line' method of base jumping.

The line connecting his chute is tied to the ledge and successfully causes the break cord to snap, which deploys the parachute.

However, video of the tragic plunge on Saturday night shows how the release line was tucked under the parachute straps without Nathy noticing. The error caused the fatal accident.

Nathy's devastated brother Ed Harrison, 39, said: 'He had done more than 5,000 jumps all over the world. He will be missed by so many.'

An experienced skydiver who was friends with Nathy and also lives in Thailand said he noticed the mistake 'as soon as I saw the video'.

Jimmy Andrews, from Cardiff, South Wales, said: 'I just couldn't understand how he didn't realise or check the parachute release line was clear. When I watched the video I immediately noticed it was trapped behind his backpack strap.

'The height of the building was too low for the parachute to release manually, which is why he had the release line for the parachute fixed to the roof. Normally the tension pulls the cord and deploys the parachute.

'Nathy was a really experienced skydiver. It's tragic that he didn't check such a simple requirement.'