Gardaí are still investigating the circumstances behind the sudden death of 18-year-old man in Stranorlar on Monday evening.
The teenager, who has been named locally as Dean Lafferty, died at his home at Admiran Park at around 8pm on Monday.
A post mortem was carried out on the remains on Tuesday.
It is understood gardaí are working on the theory the teenager may have suffered a blow to the head.
Local councillor Patrick McGowan said the death has left a dark cloud over the community.