Three people were also taken to hospital after the collisions.
Gardaí are imploring the public to slow down on regional roads after Westmeath saw two separate fatal crashes in recent days.
Marcin Nowosielski's body and his car were discovered, overturned in a ditch in Castlepollard, on Tuesday evening.
While a two vehicle collision, also in Castlepollard, saw one man in his 80s killed, with three more people hospitalised.
One of those involved, a woman in her 60s, remains in a critical condition in Midlands Regional Hospital Tullamore.
Superintendent Liam Geraghty says there's no justification for speeding:
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