William Delaney, who was living in Portlaoise went missing on 30th January 2019.
Gardai in Laois have arrested a further three people in connection with the murder of a Midlands man.
William Delaney was last seen around 3 pm on Wednesday January 30th 2019 in Monasterevin in Kildare.
Gardai were informed that June he had been killed and his body buried in the county.
A unsuccessful search was carried out around the Rock of Dunamaise.
Two women, aged in their 20s and 30s and a man in his 30s are being held in Garda stations in the Midlands and South Western regions.
Gardai are continuing to appeal people to come forward with information.
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