Probably a gardener working for Tower Hamlets in the 1990s, who died young.
Our colleague Andrew Behan had had a shot at identifying this man. While not conclusive we think this is probably correct: The only Kevin Davis I could trace who was born in 1962 and died in 1997 was a Kevin Brian Davis. He was born on 8 October 1962 and his birth was registered in Stepney. His mother's maiden name was McLeod. His death was recorded in July 1997 in the London Borough of Havering.