Caoimhin Cassidy had not been seriously injured in car crash in June 2019, police have said.
The investigation continues, and anyone with information is asked to call 101, quoting reference number 316 of 01/06/19.
Alternatively, you can submit a report online using our non-emergency reporting form via: www.psni.police.uk/makeareport/
You can also call Crimestoppers anonymously on 0800 555 111 or online at: www.crimestoppers-uk.org/
Shortly after 4am on Saturday, 1st June, 2019, emergency services responded to the report of a Red Mazda 6 car on fire on Fairview Road in Galliagh in the city.
It was when dealing with the blaze that the body of 18-year-old Caoimhin Cassidy was discovered inside the vehicle.
A post mortem examination determined Caoimhin was not seriously injured as a result of a crash, and was most likely still alive when the blaze started.
Last month, a 31-year-old man was arrested, also on suspicion of manslaughter, and was later released unconditionally.
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