Carrick on Shannon Gardai are seeking the assistance of the public into two separate events that occurred in the town over the weekend.
They are asking the public to contact them if they have any information on the whereabouts of Meath man Colm “Buddy” Boylan.
Mr Boylan was last seen in the Leitrim town on Sunday morning at 3am.
He was in town for a stag party and was wearing a dark blue polo shirt and blue jeans.
In a separate incident, a man is in a serious condition in Beaumont Hospital following an incident on Main Street in the early hours of Sunday morning.
Gardai are asking anyone who noticed this incident or separately has any information on the whereabouts of Mr Boylan to contact them on 071 9650510 or any Garda station.