Toxicology tests will be carried out to determine if a teenager's death in his Greenock home was drug related.
The body of Robbie McKenzie, 17, was found in Drumfrochar Road at about 1210 GMT on Monday.
A post-mortem examination has been held. A police spokeswoman said: "The cause of death has been unascertained and may be drug related."
Mr McKenzie was found with serious facial injuries, which are believed to have been caused by his pet dog.
Police said there were no signs of violence in Mr McKenzie's house.
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