Ex-Bikie Threatens Revenge After Brother's Murder

A former Hells Angel bikie has vowed to make the person who stabbed his brother to death in a Gold Coast dog park pay for what they've done.

Ben Geppert said he's watched his mates die around him, but nothing compares to the loss of his 17-year-old brother Harry Geppert.

Police are questioning an 18-year-old man over the stabbing in Frascott Park at Varsity Lakes about 5.40pm on Wednesday. The victim died at the scene.

Forensic officers search for evidence at Frascott Park. Photo: AAP

Geppert, who is now pursuing a life in fashion in a bid to change his life, has posted tributes to his brother on his label's Instagram page.

Ben Geppert. Photo: Instagram

"I have watched mates and close people die around me but nothing compares to the feeling of loosing (sic) my little brother," read a post by his label BG Premium Apparel.

"Harry you where (sic) a true Geppert, a soldier and I will make sure your name will live on the way it should.

"We stand up for ourselves and don't let anyone else have it over us!"

Photo: Instagram

He said his heart was broken and promised to seek justice for his brother.

"I love you more than anything regardless of the things that have gone on in our family your (sic) still my blood and I promise I wont rest till I have made this person pay!"

Police are seeking dash-cam or CCTV footage of the incident, and are keen to speak to any witnesses.