Seven-year-old Hakeem Hussain was found dead by paramedics at a house in a suburb of Birmingham. It is said that his death may have been caused by hypothermia after being outside his home in the cold.
Hakeem's mother, Laura Heath, 35, and her uncle, Timothy Busk, 56, were arrested on suspicion of wilfully ill treating a child.
West Midlands police revealed that a post-mortem examination had proved indeterminate and hence further tests would be carried out.
Hakeem's mother and great-uncle have been released under police investigation.
The headteacher at Hakeem's primary school, Nechells E-Act Academy, Julie Wright said, “Hakeem was a most beautiful little boy, a great friend to many staff and children with a wicked sense of humour and an infectious giggle. He was a warm and generous-hearted soul who was talented across many areas of the curriculum but especially so in music and arts. His performance as the Christmas star in Year 2 Nativity play last year will stay with me forever as he totally stole the show. There wasn't a dry eye in the house as he delivered his lines with poignancy, grace and humour.”