A HUNT has been launched to find a potential witness who may have seen a Hampshire toddler before he died.

Greyson Birch was found unresponsive in water at Swanwick Lakes Nature Reserve on May 30.

The two-year-old was rushed to hospital where he tragically died on June 3.

Police have now released CCTV footage of a dog walker, and a potential witness, who may be able to help with their investigation.

A spokesperson for Hampshire Constabulary said: "We’re investigating the circumstances surrounding how Greyson came to be in the water, and are keen to identify the dog walker featured in the CCTV footage.

"We appreciate the quality is poor, but we are hoping that we can reach out to this person or anyone who knows them, as we are keen to speak to them and establish whether they saw Greyson that evening at the reserve.

"If this is you, or you know this person, please call 101 quoting 44210210811.

"We have previously appealed for anyone who was at Swanwick Lakes between 7.45pm and 8.30pm on 30 May to get in touch.

"In addition, we’ve appealed to anyone who might have seen Greyson and anyone he was with earlier that day between 6.45pm and 7.15pm at Lakeside Country Park in Eastleigh to contact us."

As reported by the Daily Echo, an 18-year-old man from Southampton was arrested on suspicion of neglect and remains on bail until August 30.