Ospreys and former New Zealand full-back Adrian Cashmore has had to retire at the age of 32.
Cashmore competed with Christian Cullen for the All Black jersey
He signed a two-year deal in October, but barely featured due to back trouble and has now been diagnosed with an inoperable cluster of bulging discs.
"I must think of my future and the risks involved, it is with a heavy heart that I have decided to return to New Zealand," said Cashmore.
Cashmore won just two All Black caps as he was competing with Christian Cullen.
Adrian was a firm part of our plans for next season and we are hugely disappointed that he has had to retire
Ospreys manager Derwyn Jones
An effective goal-kicker, he also played for New Zealand Maori, the New Zealand Sevens side, Bay of Plenty, the Chiefs, and in Japan.
"Adrian was a firm part of our plans for next season and we are hugely disappointed that he has had to retire," said Ospreys regional rugby manager Derwyn Jones.
"He has made a worthy contribution to the Ospreys since joining at the start of this season although it is sad that we only saw glimpses of what he had to offer.
"He gave us security under the high ball and a reliable kicking option and these were to the fore in our wins over Glasgow and Ulster away from home.
I have a young child and I need to ensure that I can play a full part in his upbringing
"Although this is a massive loss, we should celebrate what has been an excellent career.
"It has been a pleasure for our coaches and players to work with a professional of his calibre and we wish him well in his life outside of being a professional rugby player."
Cashmore said he regretted having to leave Wales so early.
"I am delighted to have played a part in the development of Ospreys rugby and my family and I have enjoyed our time living here," he said.
"However, I must think of myself. I have a young child and I need to ensure that I can play a full part in his upbringing."