Three were people arrested so far.
Laois Gardai say there are still people with information about William Delaney's death who haven't come forward yet.
Three people were arrested as part of the 56 year old's murder investigation were released without charge last night.
Mr Delaney was last seen in Monasterevin, Kildare on the 30th of January 2019 and is presumed dead.
Officers have thanked the community for their assistance so far but continue to appeal for anyone with information to contact them.
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