A 13-year-old boy was found ''pale and shaking'' before he died in a park, an inquest has heard.
Officers were called to Ystrad Mynach Park in the early hours of the morning on April 12.
An inquest found that Carson Price, from Caerphilly, was slipping in and out of consciousness when police arrived.
A post-mortem confirmed he had consumed illegal drugs.
Newport Coroner's Court was told that the teenager's condition "rapidly deteriorated" in hospital before he died.
One person has been arrested, however the court was told the arrest was not directly concerning Carson's death.
The teenager's body has been released for a funeral to take place and the inquest has been adjourned until July.