Two-year-old Greyson Birch drowned in May this year at Swanwick Lake in Hampshire (Image: PA)

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The heartbreaking last photograph of a toddler who drowned has been released as police appeal for witnesses to come forward.

Two-year-old Greyson Birch died in hospital two days after being found unresponsive from Swanwick Lake in Hampshire on May 30.

Greyson's heartbroken family described him as "our light and life" and said it "kills us" that he is no longer here, the Sun reports.

The photograph released by Hampshire Police shows the tot wearing a blue striped top, dark shorts and white trainers.

In the pictures he is seen on a push bike, with police saying he visited Lakeside Country Park in Eastleigh between 6.45pm and 7.15pm – less than two hours before he went to the lake.

The last photo taken of Greyson has been released by the police
(Image: PA)

An 18-year-old man has been arrested on suspicion of neglect and has been bailed until August 30.

Detective Inspector Matt Gillooly, who is leading the investigation, said: "Our investigation is tracing all of the steps leading up to Greyson's tragic death, and we are looking at places he may have visited prior to Swanwick Lakes.

"We want to know if anyone at Lakeside Country Park saw him that afternoon and anyone he was with.

"Please contract if you did, as any detail around Greyson's movements that day, no matter how insignificant it may seem to you, could prove crucial in determining the full picture of this case."

When news of Greyson's death was revealed, tributes poured in for him.

In a statement, his family said Greyson was their "much loved son, brother and cherished family member."

They added: "His bubbly personality that filled all our hearts with joy and happiness will linger in this world.

"Greyson was our light and life that will still shine to us all through our thoughts and memories. Greyson would love to dance, sing, play, just everything!

"To know that each time we hear Twinkle Twinkle or someone plays Baby Shark and he's not there dancing and clapping his hands kills us to the bottom of our hearts.

"The cheeky little smile that would grace our presence will remain in our family and friends' hearts forever. I know he is now in a safe place watching over his sibling and all that came to be a part of his short but amazing life.

Swanwick Lake in Hampshire where Greyson was found unresponsive
(Image: Alamy Stock Photo)

"In this time of need we ask for all our family and close friends to be left to grieve and come to terms with the devastation that has been unwillingly let into our lives.

"His memory will remain always and live through the smiles of joy of each individual who had the pleasure of meeting him."

Police are appealing to anyone who was in the area between 7.45pm and 8.30pm to contact them.

Anyone with information is asked to contact police on 101, quoting 44210210811.

Alternatively, you can contact the independent charity Crimestoppers 100% anonymously on 0800 555 111, or via their anonymous online form at