A 56-year-old Irishman has died after being hit by a van on a Welsh motorway.
Stud farmer Michael Murphy, from Courtnacuddy, near Enniscorthy, Co Wexford, was delivering horses when his truck got a flat tyre.
The father-of-two was fixing it on the hard shoulder when the van hit him.
A 29-year-old employee was with Mr Murphy at the time, but was unharmed.
The incident happened shortly after 7.20am yesterday on the busy M4 near Newport in south-east Wales.
Police have arrested a 45-year-old man from Merthyr Tydfil on suspicion of causing death by dangerous driving.
Courtnacuddy priest Fr James Nolan said Mr Murphy was "a wonderful man loved by all".
"Our thoughts and prayers are with Michael's family at this time so close to Christmas," he said.
"It is a tragedy for all involved. His heartbroken wife is being comforted by family and friends.
"He was well-known and respected by all in the equestrian community. He will be missed."
A security guard who was first on the scene has described the "utter carnage" he encountered.
"I ran over to the guy on the floor for first aid, and he was dead," said Wayne Masefield, from Newport.
"It was utter carnage. Something like that is something no one should ever see. It shook me up a bit.
"I couldn't do anything for the guy, so I got some cones to block off the traffic."
The incident resulted in 13-mile tailbacks from Newport to Cardiff. The motorway was closed for a long period while emergency services attended the scene.
It did not reopen until after 3pm.