The teenager who is thought to have died as a result of taking legal highs has been named locally as Andrew Lourie.
The 18-year-old was taken from a house in Mortimer Road, on Friday night and died in the early hours of Saturday.
Although officers are still waiting for the results of toxicology tests, they're investigating the possibility he'd taken legal drugs.
More top news
Kerrie Gosney brings you Saturday night's forecast
Showers becoming heavy and thundery Saturday afternoon. Drier for a large part of Sunday
Robert Hodgson, from Stanley, County Durham, committed the offences on the girls, aged as young as five or six, up to the age of 13.