Gardaí in Co Monaghan are following a "strong line of enquiry" that the two incidents may be connected.
Yesterday morning, the body of one man was discovered at a house in Castleblayney while a second man was killed in a road collision nearby.
Gardaí say they are investigating all of the circumstances surrounding the discovery of a man, aged in his 60s, at a house at Knockreagh Lower, Broomfield.
It is believed the man died violently.
The man's body was removed to Our Lady of Lourdes Hospital, Drogheda where a post mortem is due to take place this morning.
It will be carried out by Dr Linda Mulligan and the results will determine the course of the investigation.
The house remains a crime scene and the technical examination of the scene by the Garda Technical Bureau continues this evening.
Gardaí are appealing for anyone who was in the Broomfield area between 5am and 6.45am this morning to contact Castleblayney Garda Station on 042 974 0668 or the Garda Confidential Line on 1800-666-111.
They are particularly interested in speaking with anyone with mobile phone footage or dashcam footage.
Separately, a male pedestrian was killed at the Ballynacarry Bridge on the N53 — Castleblayney to Dundalk Road following a collision with a car.
The man, aged in his 30s, has been removed from the scene to Our Lady of Lourdes Hospital where the post mortem will take place this morning. It will be conducted by Dr Margot Bolster.
The road has since reopened as the technical examination of the scene has concluded.
Gardaí in Carrickmacross are appealing for any witnesses to come forward including any road users who were travelling in the area yesterday morning. They are asked to make any footage available to Gardaí.
Anyone with information is asked to contact Carrickmacross Garda Station on 042 969 0190, the Garda Confidential Line on 1800 666 111, or any garda station.