Newcastle wing Andy Higgins has been forced to retire with immediate effect due to a knee injury, the Aviva Premiership club announced.
Higgins, 32, joined Newcastle last year. He previously played for Worcester, Bristol, Bath, Exeter and Sale Sharks.
"It was a tough decision to have to make, and I am ultimately disappointed to have retired from rugby," Higgins said.
"I have really enjoyed my time at Newcastle Falcons and I would like to thank the club for their support throughout this period. I would also like to thank those individuals who helped me early on in my career."
Falcons rugby director Dean Richards added: "I am disappointed that Andy has had to retire. Andy has contributed a lot to the team during his year at the club, and I wish him all the very best for the future."