The river Taff runs through Cardiff

The body of Darran Cross, 27, was discovered in August last year floating in Cardiff, five days after he disappeared during a night out with friends.

It is believed he was making a phone call to his brother Jason when he fell into the river - he was still holding his mobile phone when he was found.

Speaking after an inquest recorded an open verdict into the tragedy, Jason Cross, 29, believed someone had information but had not come forward.

Darran's death is consistent with immersion in water - it is quite probable that he died from the shock of hitting cold water Pathologist Dr Davison

On Wednesday, a pathologist told an inquest he thought Mr Cross, from Grangetown, died from the shock of hitting the cold water.

But Jason Cross said: "I am still a bit disappointed that no one came forward to tell us how Darran ended up in the river - someone must know."

The phone call between the brothers only lasted one second before cutting out.

"I believe Darran was calling to say he was in trouble and his phone cut off when he fell in the water," he added.

'Spasm'

Pathologist Dr Andrew Davison said he could not be sure exactly how panel beater Mr Cross died - but said he did not drown.

"Darran's death is consistent with immersion in water - it is quite probable that he died from the shock of hitting cold water," he said.

"Very rarely, people do suffer a heart attack when they fall into water - they don't have time to drown.

"Then they go into a form of spasm - which would explain why Darran's phone stayed in his hand."

Detective Constable Jamie Payne told the inquest Darran went missing after a night out with friend Terry Pearce.

"Terry left Darran in a club talking to some girls at about 1315 GMT and that was the last time he was seen alive," he said.

"Darran's mobile bill showed the last person he had called was his brother Jason at 0156 GMT - but that call lasted just a second," he added.

Recording the open verdict, Cardiff and Vale of Glamorgan coroner Dr Lawrence Addicott said all the signs pointed to Darran having died very suddenly.