It was the second fatal collision in the region this weekend.
A five-year-old boy and a man in his 20s have died in separate crashes in the midlands.
Gardaí and emergency services attended the scene of a collision that occurred at Kilminchy, Portlaoise, on Saturday afternoon.
The collision involving a pedestrian and a car occurred at approximately 4.20pm.
The boy was taken to Midland Regional Hospital Portlaoise in a serious condition, where he was pronounced dead a short time later and a post mortem examination is due to take place.
A technical examination is due to be carried out by Garda Forensic Collision Investigators this morning.
Gardaí are also investigating a collision in Westmeath where a man in his 20s died in a crash involving a quad bike and a motorcycle.
It happened in Ballynascarry near Finnea at about 3.30pm yesterday.
The driver of the quad bike was pronounced dead at the scene.
A passenger on the quad bike, also in his 20s, was taken to the Tullamore Regional Hospital with non life-threatening injuries - while the motorcyclist, in his 30s, was rushed to the Mater Hospital in Dublin in a critical condition.
A forensic examination of the scene will be carried out today
Gardaí are appealing to anyone who may have witnessed either collision to contact them.
€114m Westmeath Wastewater Upgrade Complete
Mary O’Rourke Praised As “Hard Working” At Bridge Naming Ceremony
No Mini Budget Planned Despite Pressure Over Fuel And Energy Prices
Africa Day Celebrations Kick Off Across The Midlands
Tánaiste Hails ‘Proof’ Of Help to Buy Scheme Success Across The Midlands
Westmeath Woman Recounts Israeli Interception
Man Charged In Connection With Fatal Offaly House Fire
Mercosur Trade Deal Kicks Into Action Ahead Of European Court Ruling
Westmeath Woman "Deeply Ashamed" Of Spitting Incident
Taoiseach Pays Tribute To Mary O'Rourke At Bridge Dedication
Midlands Walking Club Celebrates 30th Anniversary This Weekend
OPW Minister Wants "Grown Ups" To Resolve Children's Science Museum Fallout
Offaly TD Criticises VAT Disparity For Beauty And Nail Salons
Laois Council Launches Clinics For Vacant Home Grants
Former Children's TV Presenter Revisits Midlands Towns On Nostalgic Journey
€7m Shannon Callows Flood Plans Facing Key Hurdles
Appeal Lodged Against New Lidl Development In Laois
Housing Completions Jump Sharply In Laois In Early 2026
Bressie To Perform At Oprah Winfrey Dublin Show
Daniel Kinahan To Be Held In Laois Prison