The sister of a young Co Antrim motocross enthusiast who lost his life at the weekend has said her family's hearts have been broken.
Brendan Graham (22), from Carrickfergus, died at a motocross track in Desertmartin, near Cookstown, on Saturday.
It is not believed his death was the result of a motorcycle accident and no further details will be released until after a post mortem is carried out.
Mr Graham, who ran JB Handyman Services in the Co Antrim town, was well known in motocross circles and his sister Tracy said he was "a beautiful happy soul".
"Our hearts are broken, we have no words that can make this better, nothing that can fill the hole left in our lives by the crushing news we received in the early hours of this morning," she said in an online tribute.
"Brendan, you were such a beautiful and happy soul. A jigsaw piece that fit perfectly into our little family.
"I loved you like a son. Our children saw you as more like a big brother than an uncle, and you doted on them always, which I loved to see. Our lives will never be the same again."
Air Ambulance staff attended the scene on Saturday, but were unable to save the life of the young man, who was a member of the MotoCross Club of Northern Ireland.
The MCCNI committee and club offered their condolences.
"We were deeply saddened to hear the news," a spokesperson for the MCCNI said.
"Many will know Brendan from the paddock. He was such a friendly, bubbly, happy young man. He never passed vans without smiling or stopping for a chat. He touched many of our lives.
"He gained many friends from coming to the races and we all gained a friend in Brendan.
"He loved nothing more than a good day's racing with everyone. He will be greatly missed round the paddock by so many."
Cookstown Motocross Club and the Desertmartin and Mountainview team, who operate the track at Desertmartin, also extended condolences to Brendan's family and friends.
"Brendan wasn't just a motocrosser, he was our friend," the club said in a statement.
"The motocross family were so important to him and many very deep and meaningful chats have been had between us over the past few years. A very sad day for us all. I believe John 3v16 was very important to Brendan, as per the reference on his bike.
"Rest in Peace Brendan until we meet again.
"We would also like to extend our sincere thanks to the medical services, Air Ambulance and police who stayed with us throughout the day in what was very trying times."
Friends and fellow motocross enthusiasts have taken to social media over the weekend to pay tribute to their friend.
Best friend Jack Quinn is planning to pay his own tribute celebrating Brendan's life around the track.
He will be printing and distributing 300 stickers of Brendan's number plate for fellow riders to display on their bikes.
"An absolute gentleman to everyone he spoke to," he said.
"I think it would be a great wee remembrance for him."
Friend Craig Campbell also wrote: "My best mate, funniest guy I'll ever know a heart of gold and true mate always kept in touch. RIP Brendan Graham.
"My thoughts are with his mum dad and rest of family friends."