A driver may have crashed his car into a wall 10 hours before his body was discovered, gardaí have said.
The 40-year-old man was killed yesterday in the crash at Adrigole Bridge in Co Cork, on the R572 Bantry to Castletownbere road.
Gardaí believe the incident happened between 2am and 3am yesterday morning, but the scene was not discovered until noon.
Investigators have appealed to anyone who passed the scene during the morning to come forward.
The road was closed with local diversions in place as investigations continued.
A postmortem will take place tomorrow at Cork University Hospital.
It happened after a 20-year-old man was left in a critical condition in hospital after his motorbike crashed in Co Cork on Friday night.
He was travelling along the Tower to Blarney Road when his motorbike hit roadside fencing at Booleypatrick at around 11.10pm.
He was taken to Cork University Hospital.
Gardaí appealed for anyone who witnessed the incident or travelled on the Tower to Blarney Road between 10.30pm and 11.15pm on Friday night to contact them at Gurranabraher Garda station on 021-4946200, the Garda Confidential Line on 1800-666-111 or any Garda station.