Leinster head coach Leo Cullen has confirmed defence coach Kurt McQuilkin is to leave ahead of the start of the new season to return home to New Zealand for personal reasons.
McQuilkin, 50, is a former Leinster player and captain and was also defence coach under Michael Cheika as part of the backroom team that helped bring the Heineken Cup trophy to the province for the first time in 2009.
Under his stewardship, Leinster conceded the least amount of tries (27) and points (290) during the Guinness PRO12 last season.
Commenting on the news, Cullen said: "This is very sad news for Kurt and his family and our priority is supporting Kurt in his decision as best we can.
"He will be with us for a few more weeks but after that he will head back home with our very best wishes in very trying circumstances and with the thanks of everyone at Leinster Rugby for his stellar contribution over the last 12 months.
"The process of replacing Kurt has already begun but right now our focus is on Kurt and ensuring that his move back home is as seamless as possible."