Corey Sharpling, 21, was on his way to work at McDonalds in Camrarthen, West Wales, when he took a closer look at the rescue operation on the A484.
He watched council workers chop up a tree which had fallen and blocked the road, even causing a lorry to be swept into a nearby river.
But he was struck by a huge landslide of rocks and earth falling onto the road.
A witness said: "There was a loud rumble as some of the valley side slipped down the hillside.
"This poor lad was hit by the full force of it, he didn't stand a chance. It was a freak accident, if he'd stayed on the bus he would have been fine."
His heartbroken girlfriend Marsha Spittle, 18, said on Facebook: "Today I lost the love of my life – he was everything I always wanted.
“You have sadly been taken from me and your family by a terrible accident earlier tonight.
“I want you to know that I will always love you forever and always.”
Police are supporting his family and the road remains closed as debris is being removed.
A Dyfed-Powys police spokesperson said: "Officers continue to deal with a landslide on the A484 at Cwmduad, Carmarthenshire, where tragically a man has died.
"His family are being supported by specially trained officers."
The tragedy happened as Wales was battered by Storm Callum which brought the worst flooding to the region in 30 years.
A search was launched yesterday afternoon after reports that a man had fallen into the swollen waters of the River Taff in Cardiff and died.
The woman he was said to have been walking with, was released from University Hospital in Cardiff, Wales, after receiving treatment.
Another man died on Brighton Beach after horrified witnesses reported seeing him struggling in the waves.
By the time emergency services arrived at around 1.30am, the man had been in the water for 30 minutes and was no longer moving.
Callum is now causing travel chaos and rail delays as commuters in Wales have been advised against travel today as the trailing weather front sends one last pulse of miserable weather across the country.
Trains across the entire Transport for Wales Network will be subject to heavy delays, or cancellations, National Rail warned.
The Heart of Wales line will not be operating for a minimum of 48 hours as severe flooding wrecked rail lines in the Llandeilo area.
Flooding around Cardiff Central and Aberdare regions has left trains unable to run, and even motorists will be subject to heavy diversions.
Welsh police force Dyfed-Powys has advised against travel only if it is essential, as there are still an "exceptionally high" number of roads and bridges closed across Ceredigion and Camarthenshire regions.
Describing the heavy showers, Aneurin Cox, of Natural Resources Wales said: "We have looked at the records and we are looking at records about 30 years ago when we had an event of this size and significance."
And the dreary conditions are set to last until tomorrow.
Forecasters expect a fresh band of rain to push-in from the south-west.
A Met Office forecaster said: "The South West, the Midlands and western parts of London that escaped much of the storm's wrath over the last couple of days will experience very heavy downpours at times."
But as Sunday dissolves into Monday, cloud and patchy rain will remain in the south east, with generally clear, dry conditions further north and west.
Simon Partridge from the Met Office added: "There's a cool clear start for many parts of the UK on Monday, and actually for much of the UK it's a dry fine and sunny day to boot."
Storm Callum caused rivers to burst their banks and power supplies were wiped out for many across western parts over Friday and Saturday, with south Wales the worst-hit region.
Residents of Crickhowell in south Wales piled sandbags against their front doors as firefighters pump water from the local pub and submerged cars have been left abandoned.
People in the surrounding area were told to evacuate their homes overnight when more than a months worth of rain fell in 48 hours.
Almost six inches fell in a day in some sodden spots – with the wet weather set to continue for most of the country today.
One part of south Wales, the Brecon Beacons village of Libanus, recorded 182mm of rain in just 48 hours – way above the monthly total for the region of 169mm.
A Met Office forecaster said the Brecon Beacons had seen 150mm (almost six inches) of rain in 24 hours, with lower lying parts of south Wales recording 50-100mm of rain.
Wales usually sees an average rainfall in October of 169.6mm and a monthly average of 121.7mm.
Despite the storms, temperatures have been much higher for this time of year than usually expected during Autumn.
The last time temperatures exceeded 24C at this time of year was in October 2011 when a staggering 29.9C was clocked.
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