They are currently looking into a link between the man's death and a road collision approximately 11 kilometres apart.
Gardaí are investigating the sudden death of a man in his mid-40s in Buncrana, Co Donegal and have appealed for the public's help.
The man's body was discovered in a house at Oakfield Close at 6.30pm on Sunday, 18 March and he was pronounced dead at the scene.
The post-mortem examination was carried out at Letterkenny University Hospital by the Deputy State Pathologist Dr. Linda Mulligan.
However, while Gardaí can say the death was as a result of natural causes, some unexplained injuries found were consistent with either a fall or as a result of being in a vehicle involved in a collision.
Shortly before midnight on 17 March, Gardaí were called to the scene of a single-vehicle collision at Slab Road, Burnfoot, Co. Donegal, approximately 11km south of Buncrana.
A white Renault van had crashed, but there was no one present at the scene upon the arrival of Gardaí.
Currently, Gardaí are investigating a link between this van and sudden death of the man in Buncrana.
The van has been removed from the scene for a full technical examination and the roadway in the area of the crash is sealed off to facilitate a technical examination of the area by Garda Crime Scene Investigators.
Anyone with information is asked to contact Buncrana Garda Station on (074) 9320540
