The family of a motorcyclist who died in a collision with a metal bar across the Taff Trail in the Brecon Beacons have paid tribute to him.
Jamie Roberts, 28, suffered serious head injuries at Pontsticill, Merthyr Tydfil at about 1940 BST last Saturday.
He was "a larger than life character" and "loved by everyone who knew him", said his family and girlfriend.
Police want anyone who knows about the bar on the trail near Ffynon Dwyn to contact them.
In a tribute issued through South Wales Police, Mr Roberts' family said: "He had a beautiful smile and a huge heart, always helping others in need - he did this even in his last hour by donating his organs to save the lives of others.
"Jamie's philosophy in life was inspirational - 'If you're here for a short time, make sure it's a good time'.
"He did more in his 28 years than others did in their 70s.
"Jamie's memory will live on forever through his family and friends; Merthyr is a sad place without him."
Anyone with information is asked to contact South Wales Police on 101 or to e contact Crimestoppers anonymously on 0800 555 111.
- 10 August 2010