The man in his 20s was arrested on Monday morning.
The man arrested in relation to the murder of Stefan Nivelles Posschier has been released without charge.
The man in his 20s was arrested on Monday morning, and was being detained in Mullingar Garda Station.
The body of 65-year-old Stefan Nivelles Posschier was found at his home in Rattin, Westmeath on Tuesday, October 25th.
He was violently assaulted and died as a result of his injuries.
Gardaí say their investigation into Stefan's murder is ongoing.
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