POLICE last night were investigating the circumstances surrounding the death of a 15-year-old boy who was found frozen in a graveyard.

Kyle Graham, a third-year-pupil at Dunoon Grammar School, was discovered in the town's cemetery, about a mile from his home, on Wednesday afternoon.

Last night, his mother Angela was being comforted by family and friends.

Police said post-mortem results showed there appeared to be no suspicious circumstances, but said further tests were being carried out.

It is understood the pupil may have taken an overdose, but this has not been confirmed by police.

The teenager disappeared from his home in Dixon Avenue in the Kirn area of Dunoon on Tuesday morning.

His movements after about 11.30am that day are unclear.

Gilbert Graham, the boy's uncle who brought him up along with his mother, said he saw Kyle and his best friend in the main street in the town. He said he gave his nephew (pounds) 5 and a pie and told him to get back to school.

The teenager was a regular truant. Mr Graham claimed police later spoke to the two teenagers and escorted his friend back to school, but left the 6ft youngster.

His movements after that are unknown. When he failed to return home on Tuesday evening, his mother alerted police.

At the family's home yesterday, Ms Graham said her only child was her best friend.

Clutching a small picture of the boy, she said: ''I just keep asking why? He had such a fantastic future ahead of him.''

The last time she saw her son alive was on Tuesday morning when he got into a taxi with his friend.

''I can't understand why he was found near a cemetery,'' she said.

''He'd never go near a cemetery because he thought they brought you bad luck.''

Although her son regularly played truant, she said he was an intelligent child. Although he should have been in fourth year, he had been held back one year.

''He was good at art and poetry and wanted to be a graphic designer. He hated school. He was too clever to go to school. A free spirit. But he was very intelligent. He's got books on psychology and law in his bedroom.''

She also dismissed suggestions that she had had an argument with her son the previous night. It was still unclear last night how the teenager ended up in the cemetery or who found his body.

Tina Colquhoun, Ms Graham's best friend and an ''aunt'' to Kyle, said the teenager had liked a girl, but things had not worked out and said he had been a bit low lately. She ruled out any link with drugs.

Mr Graham, 52, said his nephew liked a girl who was going out with someone else, but added that he did not think he would take his own life.

''On Tuesday, I spoke to Kyle near our house. I gave him a pie and (pounds) 5 and told him to get back to school. That was the last I saw him. After I had spoken to him the police stopped him and his best pal. They took his best pal back to school, but for some reason they let Kyle go.''

A spokeswoman for Strathclyde Police confirmed that the body of a 15-year-old was recovered from Dunoon Cemetery and said that the circumstances surrounding his death were under investigation.

News of the death was broken to pupils and staff at Dunoon Grammar School yesterday.

Archie Morton, education director at Argyll and Bute Council, said: ''The pupils and staff at Dunoon Grammar are very sorry to learn of this boy's death. Our thoughts are with his family at this time.''