A man in his 20s has died after the crash which took place in the Lough Ennell area of Mullingar.
Gardaí are investigating the fatal incident which occurred at approximately 10:30am on Monday 19th July.
The man was an occupant of the car and was taken to Tallaght Hospital in critical condition.
He has since passed away.
The driver of the vehicle was a man in his late teens and was arrested at the scene for road traffic offences.
The teenager has since been released without charge.
Gardaí are appealing for anyone who was in the Tudenham Park and Lough Ennell areas on Monday between 10:00am and 11:00am on Monday July 19th with footage of any kind to contact them immediately.
Anyone with information is asked to contact Mullingar Garda Station on 044 9384000 or the Garda confidential line on 1800 666 111.