Locally named Alex, the 19-year-old was struck by a falling tree in King George Playing Fields off Botley Road on August 18.
Paramedics and an air ambulance were called to the park at around 5.45pm but he was pronounced dead at the scene.
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The area has since been taped off as flowers have been left at the scene with a tribute from his mum saying he was “taken away from us too soon”.
It read: “We love you Alex. You are a true beautiful soul that helped anyone and everyone. I’ve always been proud of you Alex.
“We will greatly miss your beautiful smile, you’re loving nature and bubbly ways. We will always be thinking of you. You are forever in our hearts and minds. RIP my beautiful boy.”
Around £2,000 has been raised on the GoFundMe page set up by Alex’s cousin to raise money for the costs of the funeral as well for living costs for her auntie, Alex’s mum, to allow her time as much time as possible to grieve.
The GoFundMe page said: “I am trying to raise funds after the tragic death of my little cousin Alex.
He was only 19 years old, just got his first flat and had his whole life ahead of him. He was the sweetest boy!
“Unfortunately he was involved in an accident with a falling tree and killed upon impact.
“I would like to raise as much as possible to help out with the costs of the funeral and living costs so my auntie can take as much time out as needed to grieve.
“Any little donation will help and will be very much appreciated in this hard time.”
To donate to the GoFundMe, visit https://www.gofundme.com/f/alex-kippax.
A tribute from the cousin at the park said: “My darling cousin Alex. I can’t believe I’m writing this. Such an amazing boy taken too soon. I hope you’ve found peak and God is taking care of you.”
Another read: “Alex, a wonderful brother you will always be in our hearts, from your goofy smile to your loving heart.
“You were taken too soon and will be missed dearly by all that were lucky enough to know you.”
A Thames Valley Police spokesperson said their “thoughts are with them at this difficult time”.
The spokesman added: “We are liaising with and assisting the Health and Safety Executive and city council to establish the circumstances around this tragic incident.”
Councillor Susan Brown, leader of Oxford City Council, said: “We are shocked and saddened by the tragic incident at King George’s Playing Field.
“Our thoughts are with the family and friends of the person who died. We are working closely with Thames Valley Police to establish what happened.”