The New Zealand rugby community is mourning the death of Shane Christie, a former Highlanders and Māori All Blacks player who became one of the country’s most outspoken voices on concussion and brain health in sport. Christie was found dead at his Nelson home early Wednesday morning. He was 39. Police confirmed they had been called to the property, adding the case would be referred to the coroner. While the exact circumstances of his death remain unconfirmed, the New Zealand Herald reported that friends believe Christie may have taken his own life. A Career on the Rise, Cut Short by…