Jeremy Max died in a motorcycle crash in rural South Canterbury on Sunday. He is seen with his two eldest children and wife, Zoe.

The 21-year-old killed in a motorcycle crash in rural South Canterbury on Sunday was a former Gloriavale member who leaves behind his 22-year-old wife with three preschool-aged children, including a premature baby.

Jeremy Max, formerly Jeremy Love, died when he crashed off a farm bike on Macaulay Rd about 5pm on Sunday, near the Milford farm where he lived and worked, about 25 kilometres north of Timaru. His death has been referred to the coroner. Police are yet to officially release his name.

However, the community has already rallied to help his wife Zoe and three young children.

Supplied Jeremy Max and his wife Zoe left Gloriavale in 2016 to start a new life together in South Canterbury.

A Givealittle page setup to help raise funds for the family says Zoe Max has no financial means as most of the couple's family members still live in Gloriavale.

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Jeremy Max is survived by his wife, formerly known as Worthy Love, a four-year-old son, a 22-month-old daughter and a 17-week-old baby who was born prematurely.

The couple grew up in the secluded Gloriavale community at Haupiri, on the West Coast, marrying when he was 17 and she was 18.

​The page says the pair left the community with their young son in 2016, wanting to start a new life together on the outside in South Canterbury.

Since leaving the community, the couple has had two more children.

The fundraising page, which has an open goal, has been set up by South Canterbury couple Liz and Graham Gregory. The Gregorys have helped support several former Gloriavale residents who have chosen to leave the community and start a new life.

The Gregorys are part of a group of friends who helped Zoe and Jeremy transition into their new life in South Canterbury.

"We would love people to support Zoe during this difficult time to relieve any financial burden. All funds are being collected on behalf of Zoe."

The page describes Jeremy as an "out-going, active, fun-loving young man".

"He enjoyed hunting, rugby and hanging with his mates. He loved his children dearly and had just taught their four-year-old son how to ride his bike on two wheels," it says.

"The family had many plans for the future and they are devastated at the loss."

As the rules at Gloriavale state anyone who leaves the community must be cut-off from family there, Zoe and Jeremy have been estranged from their parents, siblings and wider family for the past two years, it says.

"This will make the grieving process very difficult.

"Families in Gloriavale hold all their worldly possessions in common, so it's possible there will be little financial assistance offered from that direction."

Liz Gregory said family members of the couple that do live on the outside, along with friends and church members, will be mourning Jeremy's loss and want to enable Zoe to have financial freedom to bring up her beautiful children.